Russia and Ukraine have exchanged hundreds more prisoners as part of a major swap that amounted to a rare moment of cooperation in otherwise failed efforts to reach a ceasefire.

The third day of prisoner exchanges between Russia and Ukraine went ahead as planned on Sunday, wrapping up a program agreed to earlier this month, hours after a second night of deadly missile and drone strikes across much of Ukraine.

Russia, using missiles and drones, launched one of the biggest assaults on the Ukrainian capital, Kyiv, since the beginning of the war more than three years ago and hours after a prisoner exchange began.