Officials say a massive Russian attack of drones and missiles targeted the Ukrainian capital and other regions early Sunday in the country for a second consecutive night, killing at least 12 people and injuring dozens.

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.

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.