No fire broke out, and emergency services were en route to the scene. The Kyiv police clarified that the drone debris fell near a multi-story residential building, with no damage or casualties reported.

Russia launched 614 air attack munitions into Ukraine overnight into Thursday, the air force in Kyiv reported, in what the country's Foreign Minister Andrii Sybiha called a "massive combined air strike" on targets around the country.

Many of the drones aren’t particularly fast or high-tech, but they are cheap enough for the Kremlin to launch more than 700 in one night, in an effort to overwhelm Ukraine’s air defenses. Here’s what we know.