Sir Keir Starmer and Donald Trump agreed to work together at a “critical moment” for Ukraine as the US called talks taking place in Geneva on its peace plan the “most productive” so far.

Sir Keir’s call with the US president was the second in as many days, and a Downing Street spokesperson said they discussed “various aspects” of the high-level talks focusing on the peace plan in Switzerland.

“They agreed that we all must work together at this critical moment to bring about a just and lasting peace,” No 10 said.

The two leaders spoke on Sunday as US, Ukrainian and European officials, including Sir Keir’s national security adviser Jonathan Powell, held meetings.

US secretary of state Marco Rubio and Ukrainian chief negotiator Andriy Yermak said “good progress” had been made at talks so

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