Russia launched 250 drones and 14 ballistic missiles against Kyiv, Ukraine's air force said, causing fires in residential buildings. It was one of the biggest combined aerial assaults on the city since the war began. The air force said it had downed six missiles and 245 drones.

Russia and Ukraine began a major prisoner exchange, swapping hundreds of soldiers and civilians in the first phase of an exchange that was a moment of cooperation in otherwise failed efforts to reach a ceasefire in the 3-year-old war.

Russia and Ukraine have completed the first phase of what is expected to be the biggest prisoner exchange since the start of the war, with almost 800 people released on Friday.