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. It said it was now verifying whether all the bodies were indeed of Ukrainian soldiers.

Russia and Ukraine swapped prisoners of war on Saturday. Moscow returned 1,200 Ukrainian soldiers' bodies but claims it received no Russian war dead from Kyiv.