LONDON — Ukraine said it struck a Russian air base on Saturday, while Russia continued to pound 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.

Ukraine’s military General Staff said that Ukrainian forces had struck the Borisoglebsk air base in Russia’s Voronezh region, describing it as the home base of Russia’s Su-34, Su-35S and Su-30SM fighter jets.

Writing on Facebook, the General Staff said it hit a depot containing glide bombs, a training aircraft and “possibly other aircraft.”

Russia has been stepping up its long-range attacks on Ukraine. Waves of drones and missiles targeted Kyiv overnight into Friday in the largest aerial assault since Russia’s invasion of Ukraine began. On Saturday, Kyiv Mayor Vitali Klitschko said the number of people killed in the assault had increased to two. A further 31 people were wounded

— The Associated Press