Russian forces have launched a large-scale drone assault across Ukraine, where officials said three people were killed and 64 others wounded.

A concentrated, nine-minute-long Russian drone attack on Ukraine's second largest city of Kharkiv in the middle of the night killed at least two people and injured 57, including seven children, regional officials said on Wednesday.

Air assaults on Saturday killed at least four people. Kharkiv’s mayor described an overnight strike as “the most powerful attack” since the beginning of the war.