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.

More than three years into the war, Ukraine has increasingly been using drones to attack targets deep inside Russia.

Ukraine said Saturday it struck a Russian airbase in the Voronezh region. Russia has not confirmed the attack.