Russia accused Ukraine of delaying a large-scale exchange of captured soldiers and the handover of killed soldiers' bodies, an agreement reached during peace talks in Istanbul. Moscow claims to have prepared for the exchange,

Russia bombarded Ukraine’s second-largest city with massive strikes in the early hours of Saturday, its mayor said, one night after Moscow carried out one of the war’s largest aerial assaults on Ukraine.

A large-scale prisoner exchange between Russia and Ukraine -- the only concrete outcome of peace talks -- was thrown into doubt Saturday after Moscow and Kyiv accused each other of