The same data networks that enable phone apps and web surfing help drones navigate, so officials are imposing daily, patchwork shutdowns. The actions can be very disruptive to daily life.

At least 20 people were killed and more than 40 wounded in overnight Russian strikes on Ukraine, regional officials said.

Russian attacks continued on Tuesday morning, with a drone strike leaving two utility company workers injured in the eastern city of Kostiantynivka. Serhiy Horbunov, head of the city’s Military Administration, called it “cynical aggression by Russian occupiers” against civilian infrastructure.