Prime Minister Sir Keir Starmer had an awkward encounter with US President Donald Trump at what was billed as Trump's final NATO summit, held in Turkey. The two leaders stood silently side by side for the traditional "family photo" without appearing to exchange a word, though they were seated together during the main session and reportedly spoke briefly. The moment came as Trump renewed his criticism of alliance members over the Iran conflict, adding to tensions within NATO.

Trump has unsettled the alliance by attacking countries that declined to join the war against Iran, reviving his demand that Greenland — a territory of NATO member Denmark — become part of the United States, threatening to withdraw all US troops from Europe and suggesting he would not defend Spain. He appeared unaware that Starmer remained Prime Minister despite the PM announcing his resignation late the previous month. At the summit's close, Starmer described recent days of renewed US–Iran fighting as "challenging" and called for a ceasefire, while Trump declared the ceasefire with Iran over, calling its leaders "scum"; Brent crude oil rose 6.1 per cent to $78.70 in response.