WASHINGTON – The United States and Nato are working on a novel approach to supply Ukraine with weapons using funds from Nato countries to pay for the purchase or transfer of US arms, according to three sources familiar with the matter.

The renewed transatlantic cooperation on Ukraine comes as US President Donald Trump has expressed frustration with Moscow’s ongoing attacks on its neighbour.

Mr Trump, who initially took a more conciliatory tone towards Russia as he tried to end the more than three-year war in Ukraine, has threatened to start imposing tariffs and other measures if Moscow shows no progress towards ending the conflict by Aug 8.

The president said in July that the US would supply weapons to Ukraine, paid for by European allies, but did not indicate how this would be done.

Nato countries, Ukraine, and the United States are developing a new mechanism that will focus on getting US weapons to Ukraine from the Priority Ukraine Requirements List, known under the acronym PURL, the sources said.

Ukraine would prioritise the weapons it needs in tranches of roughly US$500 million (S$645 million), and Nato allies – coordinated by Nato Secretary-General Mark Rutte – would then negotiate among themselves who would donate or pay for items on the list. 

Through this approach, Nato allies hope to provide US$10 billion in arms for Ukraine, said a European official, speaking on condition of anonymity.

It was unclear over what timeframe they hope to supply the arms.

“That is the starting point, and it’s an ambitious target that we’re working towards. We’re currently on that trajectory. We support the ambition. We need that sort of volume,” the European official said.

Nato declined to comment.

The White House, Pentagon, and Ukrainian embassy in Washington did not respond to requests for comment.

Russian forces are gradually advancing against Ukraine, and control one-fifth of Ukraine’s territory. 

If a Nato country decides to donate weapons to Ukraine, the mechanism would allow that country to effectively bypass lengthy US arms sales procedures to replenish its own stocks, said one US official, speaking on condition of anonymity. 

But the Nato country would have to pay the US up front for the speedier replenishment. The money would be paid into a US-held account, possibly at the US Treasury Department, or to an escrow fund, although the exact structure remains unclear, the official said. 

Nato countries also have the option of simply paying the United States to send weapons directly to Ukraine. In that case, the payment could be made via Nato or directly to the US Department of Defence, said a second source, speaking on condition of anonymity.

This would be in addition to the United States’ own effort to identify arms from US stockpiles to send to Ukraine under the Presidential Drawdown Authority, which allows the US president to draw from current weapons stocks to help allies in an emergency.

At least one tranche of weapons for Ukraine is currently being negotiated under the new mechanism, two sources said, though it was unclear if any money has yet been transferred.

Mr Trump’s fellow Republicans in Congress have introduced legislation, known as the Peace Act, that aims to create a fund at the US Treasury in which allies can deposit money that would pay to replenish US military equipment donated to Ukraine.

Ukraine’s needs remain consistent with previous months – air defences, interceptors, systems, rockets, and artillery.

The last statement of need from Ukraine came at the July 21 Ramstein conference led by EU allies, including Britain. REUTERS