Russia fired a record 728 Shahed and decoy drones at Ukraine as well as 13 missiles, the Ukrainian air force says, in the latest escalation amid mounting Russian aerial attacks in the more than three-year war.
Ukrainian President Volodymyr Zelenskiy said the city of Lutsk, in Ukraine's northwest, bordering Poland and Belarus, was the hardest hit overnight, though 10 other regions were also struck.
Lutsk is home to airfields used by the Ukrainian army. Cargo planes and fighter jets routinely fly over the city.
Ukraine's air defences shot down 296 drones and seven missiles, while 415 more drones were lost from radars or jammed, an air force statement said.
Zelenskiy on Wednesday condemned the overnight attack and called for "biting" sanctions against Moscow and Russian oil.
"This is a telling attack - and it comes precisely at a time when so many efforts have been made to achieve peace, to establish a ceasefire, and yet only Russia continues to rebuff them all," he posted on X.