Russian soldiers were snug in their sleeping bags, sleeping off a hard day of combat in a building presumably somewhere along the front line in eastern Ukraine when their slumber was interrupted. An explosive first-person-view drone operated by the elite Birds of Magyar unit slipped into the building—and struck the snoozing Russians,

At least four people were killed in the central Ukrainian city of Dnipro by a massed Russian overnight drone strike, local officials reported, with 22 others injured.

Another 19 people are injured, as a restaurant and several buildings are set ablaze in the city, local officials say.