A 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 54, including five children, regional officials said on Wednesday.

Russian drone strikes on two districts of the Ukrainian city of Kharkiv killed two people and injured scores of others early on June 11, the mayor of Kharkiv said.

Fresh Russian strikes on Ukraine's northeastern city of Kharkiv killed two people and wounded 54 including children early Wednesday, authorities said, as Moscow pushed ahead with its relentless attacks after rejecting an unconditional ceasefire.