Ukraine's President Volodymr Zelensky has accused Russia of "doing everything it can" to prevent a meeting with Vladimir Putin to try to end the war. US President Donald Trump has sought to bring the two leaders together, but he said on Friday "that's like oil and vinegar... they don't get along too well".

Uncertainty has grown in recent days about Moscow's commitment to U.S.-led peace efforts, as Russian officials have raised objections about cornerstones of the nascent proposals.

Ukrainian President Volodymyr Zelensky said he is ready to make “some compromise” on his demand that a ceasefire takes place before any talks with Russian President Vladimir Putin – as long as some security guarantees for Ukraine are established.