Ukraine rallied support from its Western allies on Friday after Kyiv and Moscow failed to agree to a ceasefire at their first direct talks in more than three years, with Russia presenting conditions that a Ukrainian source described as "non-starters".

Russian and Ukrainian negotiators met in Istanbul under pressure from President Donald Trump to end Europe's deadliest conflict since World War Two.

Russia and Ukraine agreed to exchange 1,000 prisoners of war each during peace talks held in Istanbul on Friday, in what would be the biggest prisoner swap of the conflict. The negotiations, which lasted less than two hours and were mediated by Turkey, marked the first time the nations have engaged in direct peace talks since the war began.