Russia has sentenced an Australian man to 13 years in a maximum-security prison for fighting alongside Ukrainian forces, state prosecutors in the Russian-controlled parts of eastern Ukraine said Friday.

But the two sides failed to broker a temporary cease-fire or a meeting between their two leaders, a sign of how far apart they remain on ending the conflict.

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".