A massive Russian missile and drone barrage on Ukraine's energy infrastructure on Christmas morning was "inhumane," Ukrainian President Zelenskyy said.

Ukraine said Russia had attacked it with 60 drones overnight, of which 36 were downed, 23 were jammed by electronic warfare and one was still in the air. The Ukrainian air force said drones had been shot down in eight regions across the country in a statement posted on the Telegram app on Tuesday.