Ukraine alleged Monday that Russia mixed bodies of its own dead soldiers among the Ukrainian military dead that have been returned, and that more than a million Russians have been killed since conflict began.

Ukraine and Russia have completed an exchange of dead bodies - the final stage of a deal to bring home fallen soldiers.Kyiv said Moscow handed over 1,245 bodies on Monday, bringing the total to 6,057 in the past few days.

Ukraine received another 1,245 bodies of its soldiers killed in the war with Russia on Monday in the final stage of the repatriation of remains agreed at talks in Istanbul, Ukrainian officials said.