The Russians were assembling UAVs in workshops of the Kaluga Aerated Concrete plant, according to the sources. Locals reported powerful explosions and a fire at the factory overnight into March 13. Kaluga social media channels mentioned alleged debris falls and a blaze in “industrial enterprise buildings.

Ukraine's defense intelligence launched long-range UAV strikes against a drone manufacturing facility in the Kaluga region of Russia, with production operations concealed at a different factory, RBC-Ukraine reports,

Ukrainian long-range drones attacked a UAV production site in the village of Obukhovo, Dzerzhinsk district, Kaluga region, Russia.