Across eastern Ukraine, Russia’s tiny gains are adding up. It is capitalizing on a series of small advances and throwing significant resources into an emerging summer offensive, one that risks reshaping control over the front lines.

The attack, just hours after President Trump gave the Kremlin a new deadline to work toward ending the war, was part of a wave across the country, the authorities said.

The overnight attacks came after President Donald Trump expressed frustration with Russian President Vladimir Putin and brought closer the deadline for a ceasefire.