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.

Drone production lines were located on the grounds of an aerated concrete plant in the village of Obukhovo in Kaluga Oblast's Dzerzhinsky district, a military intelligence source claimed.

Long-range strike drones of Ukraine's Defence Intelligence hit a UAV production facility in the settlement of Obukhovo, Dzerzhinsky district, Russia's Kaluga Oblast on the evening of 12 March. Source: Ukrainska Pravda source in security services Details: The source reported that the Russians set up production lines for assembling drones inside the workshops of the Kaluga gas concrete plant.

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,

Long-range strike drones of Ukraine’s Defence Intelligence hit a UAV production facility in the settlement of Obukhovo, Dzerzhinsky district, Russia’s Kaluga Oblast on the evening of 12 March. Source: Ukrainska Pravda source in security services Details: The source reported that the Russians set up production lines for assembling drones inside the