Four people were killed in the southern city of Mykolaiv, according to the regional governor, while another died in Zaporizhzhia in an attack that authorities said injured more than a dozen.

"Four dead," Mykolaiv Governor Vitaly Kim said early Monday on Telegram, revising up an earlier toll of two after an attack that set several residential buildings on fire.

About 300 kilometres (185 miles) to the east in Zaporizhzhia, Ukraine's state emergency services agency said Russia carried out three air strikes that killed a man and damaged multiple buildings.

Zaporizhzhia region governor Ivan Fedorov said that 18 people were injured, including five children.

"Boys aged 4, 16 and 17 and girls aged 15 and 17 have received the necessary medical assistance," he said on Telegram.

Overnight Saturday into Sunday, Russia fired 145 drones at Ukraine, according to Ukrainian President Volodymyr Zelensky, more than during any previous single nighttime attack during the conflict.

Russia also said it had downed 34 Ukrainian attack drones targeting Moscow on Sunday, the largest attempted attack on the capital since the start of the war in 2022.