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.

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.

On Friday, Ukraine and Russia had each handed over 390 soldiers and civilians in the biggest prisoner exchange since Russia launched its full-scale assault in February 2022. Both countries have each agreed to swap 1,000 prisoners, with another exchange expected on Sunday.