Ukraine’s capital Kyiv came under a large-scale Russian drone and missile attack overnight into Saturday, just hours after Russia and Ukraine began a major prisoner exchange.

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 attacked Kyiv and other Ukrainian regions overnight on May 24-25, causing explosions in multiple cities. The attacks come one night after one of the heaviest Russian assaults on Kyiv throughout the full-scale war.