The summit will focus on discussing security guarantees for Ukraine if a potential peace deal will be reached. Starmer and French President Emmanuel Macron will also brief their allies on their talks with President Donald Trump in Washington earlier this week.

Buoyed by his talks with Donald Trump on Thursday, Keir Starmer will continue his diplomatic blitz with a summit of European leaders in central London on Sunday

Keir Starmer was the most recent in a rapid-fire stretch of visits from U.S. allies as they reel from Trump’s embrace of Russian President Vladimir Putin amid efforts to end the war in Ukraine.

"All satellite correction systems have officially left the chat," one of Russia's influential military bloggers said.

Thousands of people waving blue-and-yellow Ukrainian flags marched to the Russian Embassy in London on Saturday, demanding Ukraine be given more support and a place at the table in talks to end the three-year war.

U.K. Prime Minister Keir Starmer flies to Washington on a trip aimed at persuading U.S. President Donald Trump to maintain military support for Ukraine.