The comments came after the disruption in the country’s satellite service. Earlier, Ukraine said drones using Starshield, the Pentagon-funded service, were back to normal speeds.

The 44th president sharply criticized Mr. Trump, who hit back later in the day. Mr. Obama also assailed Vivek Ramaswamy, the Republican nominee for governor of Ohio.

The United States and Israel have drawn up plans to renew strikes against Iran, creating a sense of dread among war-weary residents.