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.

Hundreds of flights were delayed or canceled due to Ukrainian drone strikes on Saturday and overnight, according to Russia’s Transport Ministry.

Russia's Defence Ministry, in a report on Telegram, said air defence units had destroyed 48 Ukrainian drones in a period of just over five hours into Saturday evening. Those included five drones in the region surrounding Moscow, two of which were headed for the capital.