The massive attack across Ukraine followed another large strike the night before, and casts more doubt on the U.S.-brokered peace process.

Russia has targeted Ukraine for a second consecutive night with drones and missiles, killing at least 12 people as the two countries pursue a major prisoner swap. Ukraine’s air force said on Sunday that Russian forces attacked Ukrainian regions with 298 drones and 69 missiles overnight, one of the largest aerial attacks of the war.