In a statement, Ukrainian President Volodymyr Zelenskyy said that 64 people had been wounded and reiterated his calls for greater international pressure on Moscow.

A concentrated, nine-minute-long Russian drone attack on Ukraine's second largest city of Kharkiv in the middle of the night killed three people and injured 64, including nine children, Ukrainian officials said on Wednesday.

The assault continued Moscow’s stepped-up drone and missile attacks, which have been ratcheting up for months with nightly bombardments on regions and cities in Ukraine.