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.

Drones targeted an ammunition depot in Russia's Voronezh region, with social media channels posting video of the explosions.

Spurred by its existential fight against Russia — and limited military assistance from Western allies — Ukraine has fast become a global center for defense innovation.