Russia and Ukraine struck each other with hundreds of drones on Sunday, throwing Russian air travel in disarray, days after Moscow launched its largest aerial assault in the more than 3-year-old war.

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.

KYIV, Ukraine -- Russia targeted Ukraine overnight with 322 drones, 292 of which were "neutralized" by being either shot down or supressed by other means, according to the Ukrainian air force. Eleven people, including two children, were injured in the Kharkiv area, in a drone strike overnight there, according to local emergency services.