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.

Russia launched 550 drones and missiles across Ukraine overnight in the largest aerial assault since the war began. The capital Kyiv was the primary target.

A Ukrainian drone strike targeted a warehouse in Russia that stored fighter jets, bombs and other military assets, Ukraine's General Staff has said. The Borisoglebsk airfield in Russia's Voronezh Oblast was struck overnight, and imagery shared on social media showed the fiery aftermath of the attacks.