The barrage included 407 drones and 44 ballistic and cruise missiles, Ukrainian air force spokesperson Yurii Ihnat said.

Recent comments by senior officials in both countries indicate they remain far apart on the key conditions for stopping the war.

Ukraine said on Sunday that it had launched a spectacular surprise attack on five Russian air bases, ranging from targets close to Moscow to Russia’s Arctic, Siberia and Far East. The targets were more than 4,300 miles from Ukraine.