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.

When a Ukrainian-made drone attacked an ammunition depot in Russia last September, it showcased Kyiv’s determination to strike deep behind enemy lines and the prowess of its defense industry. The moment was especially gratifying for the woman in charge of manufacturing the drones that flew more than 1,