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.

Ukraine inflicted significant damage on a Russian airbase Saturday, amid Moscow’s continued drone attacks on Kyiv, which killed at least one person overnight — part of a prolific Russian assault that has seemed to dash any hopes of a truce in the war.