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.

Doing so would require the Russian leader to “accept the failure of sitting down with a president he considers a joke from a country that doesn’t exist”