Zelensky and European leaders have been left reeling after US President Donald Trump spoke directly to Russian President Vladimir Putin and announced the start of negotiations to end the war.

The move prompted fears among European governments that they might be cut out of a deal which could end up being too favourable to Russia and undermine their own security.

“The prime minister reiterated the UK’s commitment to Ukraine being on an irreversible path to Nato, as agreed by Allies at the Washington Summit last year,” a readout of a call with Zelensky issued by Starmer’s office said.

Starmer reiterated his position that there could be no talks “about Ukraine, without Ukraine”, and said the country needed strong security guarantees, further lethal aid and a sovereign future.

Trump’s deputy Ukraine envoy, John Coale, on Thursday said the US had not ruled out potential Nato membership for Ukraine or a negotiated return to its pre-2014 borders, contradicting comments made this week by the US defence secretary.

Zelensky said he had informed Starmer about his call with Trump.

“The security of each nation depends on strengthening our collective security,” Zelensky said on X.

“It is crucial that every new week brings tangible results that will ensure a lasting and reliable peace.”