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.

The drones were launched beginning at 8 p.m. on July 4 from six directions: Bryansk, Kursk, Oryol, Millerovo, Primorsko-Akhtarsk, and Shatalovo. Of the total, 157 drones were destroyed by air defenses,

It was the latest in a series of almost weekly large-scale missile and drone attacks. President Trump said he “didn’t make any progress” with President Vladimir V. Putin of Russia.