When Yuriy Shelmuk co-founded a company last year making drone signal jammers, he said there was little interest in the devices. It now produces 2,500 a month and has a six-week waiting list.

Demand shifted after the failure of a major Ukrainian counteroffensive in the summer of 2023 that was meant to put invading Russian forces on the back foot. Kyiv cited Russia's extensive use of unmanned aerial vehicles to spot and strike targets, as well as vast numbers of landmines and troops.

"Concentrated, cheap aerial drones stopped all our assaults," Shelmuk said. "There was an understanding that a new game changer had appeared."