According to a 23 September 2026 press release from the Prime Minister's Office and 10 Downing Street, the Prime Minister spoke with European Commission President Ursula von der Leyen on the afternoon of 22 September at the UN General Assembly.

The two leaders discussed working toward a successful outcome for the next EU-UK summit later in the year. They also reflected on challenges the EU and UK face in responding to threats from Russia in Ukraine and in relation to hybrid warfare and disinformation.

They stressed the importance of cooperation on common European security threats, reducing illegal migration and responding to unfair competition and overcapacity in global markets. They also discussed initiatives on AI safety, including in relation to the UK's G20 Presidency in 2027. The Prime Minister said he looked forward to hosting the G20 Leaders' Summit in Manchester the following year. The leaders agreed to stay in close touch.