Volodymyr Zelensky shook hands with JD Vance in their first meeting since their heated exchange at the White House in February that shocked the world.

The Ukrainian president and US vice president were pictured together at the inauguration of Pope Leo XIV in Vatican City on Sunday.

Zelensky approached Vance as he sat in the front row for the new Pontiff’s inaugural mass.

Vance rose to his feet to shake the Ukrainian war leader’s hand enthusiastically before Zelensky quickly moved on.

However, he then spotted the Second Lady, Usha Vance, out of the corner of his eye and returned to shake her hand too. 

The handshake appeared to show signs of a diplomatic thaw after the pair’s dramatically falling out earlier this year when Zelensky left the White House early on February 28 when an argument broke out in the Oval Office between himself, Donald Trump and Vance.

Vance accused the Ukrainian leader of ‘moralistic garbage’, ‘historical illiteracy’ and of being a ‘globalist’ during the tense conversation. 

He also accused Zelensky of trying ‘to litigate this in front of the American media’ after Vance claimed that a diplomatic solution was needed to the Ukraine-Russia war.

Volodymyr Zelensky (right) shook hands with JD Vance (centre) after spotting him sat in the front row for the new new Pope Leo XIV's inaugural mass

Volodymyr Zelensky (right) shook hands with JD Vance (centre) after spotting him sat in the front row for the new new Pope Leo XIV’s inaugural mass

The handshake marked the pair’s first meeting since their heated exchange at the White House in February

After moving off from his handshake with the US Vice President, Zelensky spotted the US Second Lady Usha Vance and returned to shake her hand also

After moving off from his handshake with the US Vice President, Zelensky spotted the US Second Lady Usha Vance and returned to shake her hand also

‘What kind of diplomacy, JD, you are speaking about?’ Zelensky said. ‘What do you mean?’

‘I’m talking about the kind of diplomacy that’s going to end the destruction of your country,’ a visibly angry Vance replied. 

Pope Leo XIV also shook hands with JD Vance following his inauguration mass, only weeks after his criticism of the US Vice President resurfaced. 

The US Pontiff, 69, warmly took hold of Vance’s hand as he received a series of world leaders at St Peter’s Square. 

Leo has repeatedly criticised Donald Trump‘s administration’s immigration stance.

The Pope also previously shared several articles that address Catholic Vance’s stance on immigration. One of them was titled: ‘JD Vance is wrong: Jesus doesn’t ask us to rank our love for others.’ 

Vance last week appeared to brush aside Leo’s previous criticisms as he told conservative broadcaster Hugh Hewitt: ‘I try not to play the politicisation of the Pope game.

‘I’m sure he’s going to say a lot of things that I love. I’m sure he’ll say some things that I disagree with, but I’ll continue to pray for him and the Church despite it all and through it all, and that’ll be the way that I handle it.’

US vice president JD Vance (right) reprimands Ukrainian president Volodymyr Zelensky (left)  in the Oval Office of the White House on February 28, 2025, as Donald Trump (centre) watches on

US vice president JD Vance (right) reprimands Ukrainian president Volodymyr Zelensky (left)  in the Oval Office of the White House on February 28, 2025, as Donald Trump (centre) watches on

Vance (right) accused the Ukrainian leader of 'moralistic garbage', 'historical illiteracy' and of being a 'globalist' during the tense conversation

Vance (right) accused the Ukrainian leader of ‘moralistic garbage’, ‘historical illiteracy’ and of being a ‘globalist’ during the tense conversation

Ukraine's President Volodymr Zelensky and first lady Olena Zelenska arrive for Pope Leo XIV's formal inauguration of his pontificate

Ukraine’s President Volodymr Zelensky and first lady Olena Zelenska arrive for Pope Leo XIV’s formal inauguration of his pontificate

US Vice President JD Vance and US second lady Usha Vance arrive for the inaugural Mass

The Ukrainian president and US vice president were pictured together at the inauguration of new Pope Leo XIV on Sunday

The Ukrainian president and US vice president were pictured together at the inauguration of new Pope Leo XIV on Sunday

Ukrainian President Volodymyr Zelensky (left) meets with U.S. Vice President JD Vance (right) following the inauguration ceremony of Pope Leo XIV in Vatican City

Ukrainian President Volodymyr Zelensky (left) meets with U.S. Vice President JD Vance (right) following the inauguration ceremony of Pope Leo XIV in Vatican City

Zelensky meeting with Vance and other senior Trump administration officials such as Secretary of State Marco Rubio following the new Pope's inaugural mass

Zelensky meeting with Vance and other senior Trump administration officials such as Secretary of State Marco Rubio following the new Pope’s inaugural mass

Zelensky sat down with Vance and other senior members of the Trump administration, including secretary of state Marco Rubio, after the new Pope’s inauguration.  

The meeting between came two days after the first direct talks between Ukraine and Russia in over three years in Turkey, where a prisoner exchange was agreed but no progress made on securing a ceasefire.

‘We discussed the talks in Istanbul, where the Russians sent a low-level delegation with no decision-making powers,’ Zelensky wrote on Telegram following the meeting with Vance at the US ambassador’s residence in Rome after the two of them attended Pope Leo’s inaugural mass in the Vatican.

‘We also touched on the need for sanctions against Russia, bilateral trade, defence cooperation, the situation on the battlefield and the future exchange of prisoners,’ Zelensky added. 

US Secretary of State Marco Rubio and Zelensky’s aide Andriy Yermak were also present at the meeting, where the two sides discussed steps towards a just and lasting peace in Ukraine.

Vance also held a meeting with the European Commission President Ursula von der Leyen and Italy’s Prime Minister Georgia Meloni.

A senior Ukrainian official from the president’s office, who spoke on condition of anonymity, told AFP that Zelensky and Vance also discussed preparations for Monday’s telephone conversation between US President Donald Trump and Russian President Vladimir Putin.

Trump wrote on his social media platform Truth Social on Saturday that he would speak by phone with Putin on Monday in order to stop the ‘BLOODBATH’ in Ukraine.

Vice President JD Vance also shook hands with Pope Leo XIV after the formal inauguration of his pontificate in St. Peter's Square

Vice President JD Vance also shook hands with Pope Leo XIV after the formal inauguration of his pontificate in St. Peter’s Square

The US Pontiff, 69, warmly took hold of Vance's hand as he received a series of world leaders at St Peter's Square

The US Pontiff, 69, warmly took hold of Vance’s hand as he received a series of world leaders at St Peter’s Square

Ukraine's President Volodymyr Zelensky arrives at St Peter's Square to attend Pope Leo XIV's inaugural mass

Ukraine’s President Volodymyr Zelensky arrives at St Peter’s Square to attend Pope Leo XIV’s inaugural mass 

Pope Leo XIV meets Ukrainian President Volodymyr Zelensky and his wife Olena after the mass for the beginning of his pontificate

Pope Leo XIV meets Ukrainian President Volodymyr Zelensky and his wife Olena after the mass for the beginning of his pontificate 

Leo said this morning at his inaugural mass that he wanted to confront modern challenges.

Vance was one of the last foreign officials to see Pope Francis before he died, and paid his respects at the Argentine pope’s tomb upon arriving in Rome late Saturday.

The Pontiff said during his homily ‘we still see too much discord, too many wounds caused by hatred, violence, prejudice, the fear of difference, and an economic paradigm that exploits the Earth’s resources and marginalises the poorest’. 

Leo said he wanted to be a servant to the faithful through the two dimensions of the papacy: love and unity.

He said: ‘I would like that our first great desire be for a united church, a sign of unity and communion, which becomes a leaven for a reconciled world.’

He said there was no room in the church for religious propaganda or power play.

It comes as the Vatican confirmed the first US Pontiff will hold a private meeting this afternoon with Zelensky. 

Leo has offered the Vatican as a venue for peace talks between Ukraine and Russia to help solve the ‘very difficult, dramatic situation‘.

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican -- May 18, 2025

 Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican — May 18, 2025

Pope Leo XIV walks during his inaugural mass in St Peter's Square at the Vatican, Rome -- May 18, 2025

Pope Leo XIV walks during his inaugural mass in St Peter’s Square at the Vatican, Rome — May 18, 2025

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Pope Leo XIV blesses a child as he arrives on the popemobile for his inaugural mass

Pope Leo XIV blesses a child as he arrives on the popemobile for his inaugural mass

Pope Leo XIV greets the faithful as people hand him babies as he arrives in the popemobile

Pope Leo XIV greets the faithful as people hand him babies as he arrives in the popemobile

Ukraine's President Volodymr Zelensky and Vice President JD Vance greet each other as Secretary of State Marco Rubio (centre) looks on

Ukraine’s President Volodymr Zelensky and Vice President JD Vance greet each other as Secretary of State Marco Rubio (centre) looks on

Pope Leo XIV attends his inaugural mass in Saint Peter's Square, at the Vatican

Pope Leo XIV attends his inaugural mass in Saint Peter’s Square, at the Vatican

Cardinal Luis Antonio Tagle places the Ring of the Fisherman on the finger of Pope Leo XIV

Cardinal Luis Antonio Tagle places the Ring of the Fisherman on the finger of Pope Leo XIV

The Ring of the Fisherman - named in honour of the first pope, Saint Peter

The Ring of the Fisherman – named in honour of the first pope, Saint Peter

The Clergy at their seats during the Inauguration Mass of Pope Leo XIV

The Clergy at their seats during the Inauguration Mass of Pope Leo XIV

Pope Leo XIV leads a Holy Mass for the beginning of his pontificate -- May 18, 2025

Pope Leo XIV leads a Holy Mass for the beginning of his pontificate — May 18, 2025

Pope Leo XIV attending his inaugural mass in St Peter's Square this morning

Pope Leo XIV attending his inaugural mass in St Peter’s Square this morning

The Clergy take their seats ahead of the inauguration mass -- May 18, 2025

The Clergy take their seats ahead of the inauguration mass — May 18, 2025

Priests wave and cheer and hold up their mobile phones to get a snapshot of history inside St Peter's Square, Vatican City

Priests wave and cheer and hold up their mobile phones to get a snapshot of history inside St Peter’s Square, Vatican City 

Pope Leo XIV sprinkles water as he blesses the faithful at a Holy Mass for the beginning of his pontificate

Pope Leo XIV sprinkles water as he blesses the faithful at a Holy Mass for the beginning of his pontificate

Cardinals prepare take their places during the inaugural mass of Pope Leo XIV

Cardinals prepare take their places during the inaugural mass of Pope Leo XIV

Prince Edward, Duke of Edinburgh, arrives at St Peter's Square for the inaugural mass

Prince Edward, Duke of Edinburgh, arrives at St Peter’s Square for the inaugural mass

Guests and dignitaries attend the inaugural Mass of Pope Leo XIV's pontificate

Guests and dignitaries attend the inaugural Mass of Pope Leo XIV’s pontificate

Pope Leo XIV at his inaugural mass in St Peter's Square, at the Vatican

Pope Leo XIV at his inaugural mass in St Peter’s Square, at the Vatican

Pope Leo XIV leads a Holy mass for the beginning of his pontificate

Pope Leo XIV leads a Holy mass for the beginning of his pontificate

Pope Leo XIV holds a baby as he arrives ahead of the inauguration mass

Pope Leo XIV holds a baby as he arrives ahead of the inauguration mass

Pope Leo XIV receives the pallium by French Cardinal Dominique Mamberti

Pope Leo XIV receives the pallium by French Cardinal Dominique Mamberti

Nuns react on the day Pope Leo XIV holds his inaugural Mass in Saint Peter's Square

Nuns react on the day Pope Leo XIV holds his inaugural Mass in Saint Peter’s Square

Pope Leo XIV looks at the Ring of the Fisherman after it was placed on his finger. He turned his hand to look at the ring and seal and then clasped his hands in front of him in prayer

Pope Leo XIV looks at the Ring of the Fisherman after it was placed on his finger. He turned his hand to look at the ring and seal and then clasped his hands in front of him in prayer

Pope Leo XIV holds his inaugural mass in St Peter's Square, at the Vatican

Pope Leo XIV holds his inaugural mass in St Peter’s Square, at the Vatican

Pope Leo XIV greeting the crowd from the popemobile before a Holy mass for the beginning of his pontificate

Pope Leo XIV greeting the crowd from the popemobile before a Holy mass for the beginning of his pontificate

A woman reads a book during Pope Leo XIV's inaugural mass at the Vatican

A woman reads a book during Pope Leo XIV’s inaugural mass at the Vatican

Pope Leo XIV leads a Holy mass for the beginning of his pontificate

Pope Leo XIV leads a Holy mass for the beginning of his pontificate

Pope Leo XIV blesses a baby as he arrives on the popemobile for his inaugural Mass

Pope Leo XIV blesses a baby as he arrives on the popemobile for his inaugural Mass

Members of the clergy attend the inaugural mass of Pope Leo XIV in St Peter's Square

Members of the clergy attend the inaugural mass of Pope Leo XIV in St Peter’s Square

A woman waves a United States flag ahead of Pope Leo XIV's formal inauguration of his pontificate

A woman waves a United States flag ahead of Pope Leo XIV’s formal inauguration of his pontificate

Pope Leo XIV waves to the faithful from the popemobile -- May 18, 2025

Pope Leo XIV waves to the faithful from the popemobile — May 18, 2025

Priests wait for the start of the Holy Mass for the Beginning of the Pontificate of Pope Leo XIV

Priests wait for the start of the Holy Mass for the Beginning of the Pontificate of Pope Leo XIV

A faithful holds up a U.S. flag at the Saint Peter's Square, on the day Pope Leo XIV holds his inaugural Mass

A faithful holds up a U.S. flag at the Saint Peter’s Square, on the day Pope Leo XIV holds his inaugural Mass

The leaders of Britain, Germany and France also want to talk to Trump ahead of that call with Putin, German Chancellor Friedrich Merz said. The US president has increased pressure on Ukraine and so far abstained from critisising Putin, who started the biggest conflict in Europe since World War Two. 

Speaking moments after Sunday’s Mass, Leo mentioned the ‘martyred’ Ukraine and called for a ‘just and lasting peace’. 

Earlier, the Ukrainian President warmly greeted a smiling US Vice President JD Vance as the Secretary of State Marco Rubio looked on. 

Echoing the priorities of his predecessor, Pope Francis, Leo criticised the global economic system.

He also warned against the centralization of power within the papacy, saying he would seek to govern ‘without ever yielding to the temptation to be an autocrat’.

Leo appeared to choke up ahead of his homily when the two potent symbols of the papacy were placed on him – the pallium wool stole over his shoulders and the fisherman’s ring on his finger – as if the weight of responsibility had just sunk in.

He turned his hand to look at the ring and seal and then clasped his hands in front of him in prayer.

The crowd cheered and plenty of Peruvian, American and Holy See flags mixed with flags of other nations and banners.

Priests pose for a selfie ahead of Pope Leo XIV's inaugural Mass in Saint Peter's Square

Priests pose for a selfie ahead of Pope Leo XIV’s inaugural Mass in Saint Peter’s Square

A general view shows people attending a Holy mass led by Pope Leo XIV for the beginning of his pontificate

A general view shows people attending a Holy mass led by Pope Leo XIV for the beginning of his pontificate

A US flag is held up by a man ahead a Holy Mass for the Beginning of the Pontificate of Pope Leo XIV

A US flag is held up by a man ahead a Holy Mass for the Beginning of the Pontificate of Pope Leo XIV

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Clergy members gather on the day of Pope Leo XIV's inaugural Mass at the Vatican

Clergy members gather on the day of Pope Leo XIV’s inaugural Mass at the Vatican

A person holds a US flag as people gather in St. Peter's Square ahead of Pope Leo XIV's inauguration mass

A person holds a US flag as people gather in St. Peter’s Square ahead of Pope Leo XIV’s inauguration mass

Pope Leo XIV waves to the masses as he rides through the piazza on the popemobile

Pope Leo XIV waves to the masses as he rides through the piazza on the popemobile 

At the end of the Mass, Leo expressed hope for negotiations to bring a ‘just and lasting peace’ in Ukraine and offered prayers for the people of Gaza, children, families and elderly who are ‘reduced to hunger’, he said.

Leo made no mention of hostages taken by Hamas from southern Israel on October 7, 2023, as Francis usually did when praying for Gaza.

Princess Charlene of Monaco and Spain‘s King Felipe VI and Queen Letizia were among the royals in attendance. 

Buckingham Palace announced last week King Charles would not be at the inauguration mass and instead sent the Duke of Edinburgh Prince Edward to represent him.

While most wore black, the handful of Catholic queens and princesses – Princess Charlene Queen and Letizia among others – wore white in a special privilege allowed them. 

People had streamed into the square in the Vatican City ahead of celebrating history’s first American pope with a formal installation ceremony.

Civil protection crews in neon uniforms had earlier funnelled pilgrims into quadrants in the piazza while priests and patriarchs hurried into St Peter’s Basilica to get ready for the Mass. 

Faithful gather on the day Pope Leo XIV holds his inaugural Mass in Saint Peter's Square

Faithful gather on the day Pope Leo XIV holds his inaugural Mass in Saint Peter’s Square

Well wishers pray during the inauguration mass of Pope Leo XIV

Well wishers pray during the inauguration mass of Pope Leo XIV

People gather in St.Peter's Square for Pope Leo XIV's inauguration mass

People gather in St.Peter’s Square for Pope Leo XIV’s inauguration mass

Leo started the day by taking his first tour through the piazza in the popemobile. The open-topped vehicle has become synonymous with the papacy’s global reach and mediatic draw, used at home and abroad to bring popes close to their flock.

The bells of St Peter’s Basilica rang as Leo waved from the back of the vehicle that looped slowly through the square as the crowd waved flags and cheered ‘Viva il Papa!’. 

Born in Chicago, the pontiff spent many years as a missionary in Peru and also has Peruvian citizenship, meaning he is also the first pontiff tied to that South American nation.

One person in the crowd shouted out ‘White Sox, White Sox,’ referring to the Chicago baseball team at the bottom of the American League standings

It was here that Francis took his last popemobile ride on Easter Sunday, and it was on the back of a popemobile that Francis’ casket was brought across Rome last month to its final resting place.

Leo, an Augustinian missionary elected May 8 after a 24-hour conclave, seems a bit more timid than Francis. 

But all eyes will be on how he manages the throngs of pilgrims, tourists and curiosity-seekers, and the babies who will inevitably be passed up to him for him to bless. 

After the festive public tour in the square, Leo will head into the basilica to begin the solemn ceremony to inaugurate his ministry in a series of rites that emphasise the service that he’s called to perform in leading the Catholic Church. 

He prays first at the tomb of St. Peter, considered to be the first pope, under the basilica’s main altar and then processes out into the piazza for the Mass.

Strict diplomatic protocol dictates the seating arrangements, with both the United States and Peru getting front-row seats thanks to Leo’s dual citizenship. 

Vance, a Catholic convert who tangled with Francis over the Trump administration’s mass migrant deportation plans, is being joined by US Secretary of State Marco Rubio, who arrived in Rome ahead of time to try to advance Russia-Ukraine peace talks.

Peruvian President Dina Boluarte is one of around a dozen heads of state attending.

US seminarian Ethan Menning, 21, from Omaha, Nebraska, wrapped himself in an American flag, purchased at a truck stop in Iowa, to celebrate.

Nuns sit on the ground and eat ahead of Pope Leo XIV arriving at St Peter's Square -- May 18, 2025

Nuns sit on the ground and eat ahead of Pope Leo XIV arriving at St Peter’s Square — May 18, 2025

Pope Leo XIV holds his inaugural Mass in St Peter's Square, at the Vatican

Pope Leo XIV holds his inaugural Mass in St Peter’s Square, at the Vatican

A person holds a Palestinian flag during Pope Leo XIV's inaugural mass

A person holds a Palestinian flag during Pope Leo XIV’s inaugural mass

The pallium, or lambswool stole, centre, and the fisherman's ring, bottom, symbols of the papacy, are seen on the altar

The pallium, or lambswool stole, centre, and the fisherman’s ring, bottom, symbols of the papacy, are seen on the altar

Pope Leo XIV attends his inaugural mass in St Peter's Square, at the Vatican

Pope Leo XIV attends his inaugural mass in St Peter’s Square, at the Vatican

Pope Leo XIV walks towards the popemobile on the day of his inaugural Mass

Pope Leo XIV walks towards the popemobile on the day of his inaugural Mass

A woman looks up during Pope Leo XIV's inaugural mass at the Vatican

A woman looks up during Pope Leo XIV’s inaugural mass at the Vatican

Guest arrives ahead of the inauguration mass of Pope Leo XIV in St Peter's Square

Guest arrives ahead of the inauguration mass of Pope Leo XIV in St Peter’s Square

Nuns during the Inauguration Mass of Pope Leo XIV -- May 18, 2025

Nuns during the Inauguration Mass of Pope Leo XIV — May 18, 2025

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Pope Leo XIV walks during his inaugural mass in St Peter's Square

Pope Leo XIV walks during his inaugural mass in St Peter’s Square

Nuns pray during the inauguration mass of Pope Leo XI

Nuns pray during the inauguration mass of Pope Leo XI

A person is wrapped in a Spanish flag as they attend Pope Leo XIV's inaugural mass

A person is wrapped in a Spanish flag as they attend Pope Leo XIV’s inaugural mass

A person reads a newspaper with an image of Pope Leo XIV, on the day Pope Leo XIV holds his inaugural mass

A person reads a newspaper with an image of Pope Leo XIV, on the day Pope Leo XIV holds his inaugural mass

Grand Duke Henri of Luxembourg and Grand Duchess Maria Teresa at St Peter's Square

Grand Duke Henri of Luxembourg and Grand Duchess Maria Teresa at St Peter’s Square

Prince Albert II of Monaco (right) and his wife Princess Charlene of Monaco arrive to attend a Holy Mass

Prince Albert II of Monaco (right) and his wife Princess Charlene of Monaco arrive to attend a Holy Mass

Pope Leo XIV waves to the crows as he tours St Peter's on the popemobile -- May 18, 2025

Pope Leo XIV waves to the crows as he tours St Peter’s on the popemobile — May 18, 2025

People and nuns gather in St.Peter's Square for Pope Leo XIV's inauguration mass

People and nuns gather in St.Peter’s Square for Pope Leo XIV’s inauguration mass

Jordanian Prince Ghazi bin Mohammad (centre) is greeted as he arrives for Pope Leo XIV's Inauguration mass

Jordanian Prince Ghazi bin Mohammad (centre) is greeted as he arrives for Pope Leo XIV’s Inauguration mass

Vatican officials carry the chair of Pope Leo XIV ahead of the inauguration mass

Vatican officials carry the chair of Pope Leo XIV ahead of the inauguration mass

People in the crowd hold up their phones to take photos of Pope Leo XIV as he tours through the piazza

People in the crowd hold up their phones to take photos of Pope Leo XIV as he tours through the piazza

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Pope Leo XIV arrives on the popemobile for his inaugural Mass at the Vatican

Faithful follow Pope Leo XIV formally inaugurating his pontificate

Faithful follow Pope Leo XIV formally inaugurating his pontificate

Pope Leo is flanked by security as he rides through St Peter's Square on the popemobile

Pope Leo is flanked by security as he rides through St Peter’s Square on the popemobile

Well-wishers attend the inauguration mass of Pope Leo XIV in St Peter's Square

Well-wishers attend the inauguration mass of Pope Leo XIV in St Peter’s Square

Germany's Chancellor Friedrich Merz arrives for the inaugural Mass of Pope Leo XIV

Germany’s Chancellor Friedrich Merz arrives for the inaugural Mass of Pope Leo XIV

Pope Leo XIV waves as he arrives ahead of the inauguration mass

Pope Leo XIV waves as he arrives ahead of the inauguration mass

Newly elected Pope Leo XIV attends his Papal inauguration mass

Newly elected Pope Leo XIV attends his Papal inauguration mass

‘Rome always felt like home for a Catholic, but now coming here and seeing one of our own on the throne of Peter … it almost makes Jesus himself more accessible,’ he said.

Kalen Hill, a pilgrim from the US, got to St. Peter’s soon after the gates opened Sunday morning and said he never expected an American would lead the 1.4 billion strong church.

‘I would say all the Americans are emotional about it,’ he said. ‘It is really powerful for American Catholics who sometimes feel separated from the world church to be brought in and included in this community through Pope Leo.’

During the Mass, Leo will receive the two potent symbols of the papacy: the lambswool stole, known as a pallium, and the fisherman’s ring. 

The pallium, draped across his shoulders, symbolizes the pastor carrying his flock as the pope carries the faithful. 

The ring, which becomes Leo’s official seal, harks back to Jesus’ call to the apostle Peter to cast his fishing nets.

The other symbolically important moment of the Mass is the representational rite of obedience to Leo: Whereas in the past all cardinals would vow obedience to the new pope, more recent papal installations involve representatives of cardinals, bishops, priests, deacons, nuns, married couples and young people participating in the rite.

Another change from the past is that Sunday’s Mass isn’t a coronation ceremony, which used to involve the pope receiving a tiara, but is merely known as a ‘Eucharistic Celebration for the start of the Petrine ministry of the Bishop of Rome’.

In the days since his historic election, Leo has already sketched out some of his key priorities as pope. 

In his first foreign policy address, he said the Holy See’s three pillars of diplomacy were peace, justice and truth. 

In his first major economics address, he emphasized the Catholic Church’s social doctrine and the search for truth. 

It’s not known if he’ll use his installation homily as a mission statement as some of his predecessors did.

In his Oct. 22, 1978 installation homily, St. John Paul II uttered a phrase that became something of a refrain of his pontificate and the ones that followed: ‘Be not afraid! Open wide the doors to Christ!’

A Swiss Guard stands in St Peter's Square, on the day Pope Leo XIV holds his inaugural Mass

A Swiss Guard stands in St Peter’s Square, on the day Pope Leo XIV holds his inaugural Mass

Belgium's King Philippe (second from the right) and Belgium's Queen Mathilde (centre) arrive to attend the Holy Mass

Belgium’s King Philippe (second from the right) and Belgium’s Queen Mathilde (centre) arrive to attend the Holy Mass

Italy's President Sergio Matarella and his wife Laura Matarella arrive to attend a Holy Mass for the beginning of the pontificate of Pope Leo XIV

Italy’s President Sergio Matarella and his wife Laura Matarella arrive to attend a Holy Mass for the beginning of the pontificate of Pope Leo XIV

Faithful gather at the Saint Peter's Square, on the day Pope Leo XIV holds his inaugural Mass

Faithful gather at the Saint Peter’s Square, on the day Pope Leo XIV holds his inaugural Mass

Canadian Prime Minister Mark Carney arrives for the inaugural Mass of Pope Leo XIV

Canadian Prime Minister Mark Carney arrives for the inaugural Mass of Pope Leo XIV

Pope Leo XIV on his popemobile tours St Peter's Square at the Vatican which was being beamed onto giant Samsung television screens

Pope Leo XIV on his popemobile tours St Peter’s Square at the Vatican which was being beamed onto giant Samsung television screens 

Worshippers attend the inauguration mass of Pope Leo XIV -- May 18, 2025

Worshippers attend the inauguration mass of Pope Leo XIV — May 18, 2025

Princess Charlene of Monaco and Prince Albert II of Monaco arrive ahead of the inauguration mass of Pope Leo XIV

Princess Charlene of Monaco and Prince Albert II of Monaco arrive ahead of the inauguration mass of Pope Leo XIV

European Commission President Ursula Von der Leyen (centre) arrives to attend a Holy Mass

European Commission President Ursula Von der Leyen (centre) arrives to attend a Holy Mass

A Pontifical Swiss guard stands as nuns arrive in St. Peter's Square ahead of Pope Leo XIV's inauguration mass

A Pontifical Swiss guard stands as nuns arrive in St. Peter’s Square ahead of Pope Leo XIV’s inauguration mass

People gather to attend Pope Leo XIV's formal inauguration of his pontificate with a mass in St. Peter's Square

People gather to attend Pope Leo XIV’s formal inauguration of his pontificate with a mass in St. Peter’s Square

Spain's King Felipe VI and Queen Letizia arrive for Pope Leo XIV's formal inauguration

Spain’s King Felipe VI and Queen Letizia arrive for Pope Leo XIV’s formal inauguration

Pope Benedict XVI quoted his predecessor during his installation homily, on April 25, 2005, and offered a meditation on the symbols of church unity represented by the pallium and fisherman’s ring. 

Francis’ installation homily, on March 19, 2013, focused on the need to protect the environment, an early hint of what would become one of the priorities of his pontificate. 

Leo has vowed all efforts to find peaceful ends to the wars in Ukraine, Gaza and elsewhere. 

But as a priority, he has also identified the challenges to humanity posed by artificial intelligence, making the parallel to the challenges to human dignity posed by the industrial revolution that were confronted by his namesake, Pope Leo XIII, who was pope from 1878-1903.

After the homily and at the end of the Mass, Leo will offer a final blessing and then go into the basilica to greet the heads of the more than 150 official delegations attending.

Security was tight, as it was for Francis’ funeral on April 26, which drew an estimated 250,000 people. Rome authorities are planning for another 250,000 on Sunday. 

The piazza and main boulevard leading to it, and two nearby piazzas were set up with giant television screens, and dozens of portable toilets have been erected in a nearby park.