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

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.

At least 14 people have been injured in a major Russian missile and drone attack on Kyiv, city authorities say. Russia launched 250 drones and 14 ballistic missiles against Kyiv, Ukraine's air force said,