KYIV, Ukraine — Ukraine said it struck a Russian airbase on Saturday, while Russia continued to pound Ukraine with hundreds of drones overnight as part of a stepped-up bombing campaign that has further 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.

Russia unleashed over 500 drones and missiles on Ukraine overnight in what is described as the most extensive aerial attack since the war began, with Kyiv being the main target. At least 23 people were injured, and multiple residential buildings in the capital were damaged.