Russian air defence units shot down eight Ukrainian drones headed for Moscow late on Sunday, from a total of 90 overnight over Russian territory, the Black Sea and the Crimean peninsula, the defence ministry said.

Ukraine said it struck a Russian air base on Saturday, while Russia continued to attack Ukraine with hundreds of drones overnight as part of a stepped-up bombing campaign that has dashed hopes for a breakthrough in efforts to end the more than 3-year-old war.

Hundreds of flights were delayed or canceled due to Ukrainian drone strikes on Saturday and overnight, according to Russia’s Transport Ministry.