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.

Ukraine has struck a major Russian air base as Moscow bombards Kyiv and western regions with hundreds of drones in one of the most intense escalations of the war yet.

Russia fired 322 drones and decoys into Ukraine overnight into Saturday, Ukraine's air force said. Of these, 157 were shot down and 135 were lost, likely having been electronically jammed.