"The Prime Minister was clear that our support for Ukraine is unwavering - international borders must not be changed by force and Ukraine must have robust and credible security guarantees to defend its territorial integrity as part of any deal," a readout of a call from Starmer's Downing Street office said.

British Prime Minister Keir Starmer praised President Donald Trump during a gathering of European leaders ahead of the U.S.-Russia meeting in Alaska. Starmer, who has maintained a tense but friendly relationship with the White House,

British Prime Minister Keir Starmer on Wednesday said there was now a "viable" chance for a Ukraine ceasefire, ahead of talks between US President Donald Trump and Russia's Vladimir Putin.