Across the Middle East, Britain’s role in conflict has often been indirect yet consequential. From the late imperial period to contemporary defence partnerships, the United Kingdom has supplied weapons, technology, finance and military personnel to regional allies engaged in wars and security operations. These relationships, justified in terms of strategic stability and alliance commitments, have at times intersected with credible allegations of human-rights abuses and violations of international humanitarian law. This series examines Britain’s involvement country by country, tracing military deployments, arms transfers, technical support and financial ties to assess where and how British policy has shaped conflicts across the wider region, and what responsibilities may follow.

The UK had no formal military cooperation agreement with the Syrian government. However, following the outbreak of the Syrian civil war in 2011 and the subsequent rise of the Islamic State (ISIS) in 2013–14, the UK launched Operation Shader as part of the US-led coalition to counter the group.

In 2014, the Royal Air Force (RAF) began conducting airstrikes against داعش targets in Iraq, with operations extending to Syria in 2015 following parliamentary approval. By early 2019, the RAF reported having conducted over 1,700 airstrikes against ISIS targets. The Ministry of Defence stated that these operations had resulted in the deaths of several thousand ISIS fighters, while officially acknowledging a single civilian casualty. This incident occurred in 2018, when a Reaper drone strike allegedly killed a civilian who entered the target area on a motorbike (the official account of this has been contested by the civilian recording group Airwars). Then defence secretary Gavin Williamson described the incident as “deeply regrettable”.

It has been widely questioned whether only one civilian casualty resulted from such a large number of strikes, many of them in or near populated areas. Independent monitoring organisations, including AOAV, have assessed that additional civilian harm likely occurred during Operation Shader. For example, incidents in areas such as Abu Kamal in 2016 have been reported in which several civilians may have been killed in strikes involving RAF assets, although attribution is often contested.

In 2017, coalition strikes in Raqqa were reported by US authorities to have resulted in civilian casualties, including an incident in which 12 civilians were killed and six injured. While UK aircraft were involved in operations in the area, the Ministry of Defence has stated that it has no evidence that RAF strikes caused civilian casualties in that specific case, highlighting the difficulty of attributing responsibility within coalition operations.

In 2018, a strike near al-Khashmah involving coalition aircraft was assessed in a report by the US-led Combined Joint Task Force – Operation Inherent Resolve to have caused civilian casualties, reportedly due to their proximity to the target. UK Reaper drones and Typhoon aircraft were active in the wider area at the time. However, as with other incidents, attribution to specific national forces remains complex, and the UK has not accepted responsibility for civilian harm in this case.

Reports of British special forces, including elements of the SAS, SBS and Special Reconnaissance Regiment, operating in Syria have periodically emerged, although such deployments are not officially confirmed by the UK government. Following the Syrian regime’s use of chemical weapons in 2013, there were media reports suggesting that UK special forces may have been involved in reconnaissance activities related to potential targeting, despite a parliamentary vote against direct military intervention at that time.

In 2018, Sergeant Matt Tonroe was killed in Syria during an operation against ISIS. The Ministry of Defence initially gave limited details about the circumstances of his death, consistent with its policy of not commenting on special forces activities. It was later reported that he had been operating alongside US forces.

More recently, there have been reports of limited diplomatic engagement with armed groups in Syria. The UK government has maintained that any such contacts are conducted in line with counter-terrorism legislation and for purposes such as humanitarian access or conflict de-escalation. Hayat Tahrir al-Sham (HTS), formerly known as Jabhat al-Nusra, remains a proscribed terrorist organisation under UK law. The group has been accused by human rights organisations of serious abuses, including arbitrary detention, torture and extrajudicial killings. Groups such as the Syrian Network for Human Rights have documented large numbers of detentions and enforced disappearances in areas under its control.