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.

Ukrainian military intelligence drones (HUR) attacked a camouflaged drone production facility in Kaluga Oblast late on March 12, HUR sources confirmed for the Kyiv Independent. Drone production lines were located on the grounds of an aerated concrete plant in the village of Obukhovo in Kaluga Oblast's Dzerzhinsky district,

Russia's Defense Ministry claimed its forces had intercepted a massive strike of 337 Ukrainian drones across multiple regions, including 91 over Moscow Oblast, 126 over Kursk Oblast, 38 over Bryansk Oblast,

President Trump and President Vladimir V. Putin both claimed that Ukrainian forces were surrounded. Ukraine’s top military commander vowed to “hold the line.”

Russia's Security Council's Deputy Chairman Dmitry Medvedev attends a meeting of the Council for Science and Education at the Joint Institute for Nuclear Research in the Moscow region's city of Dubna,

Russian President Vladimir Putin said Friday he will spare the lives of Ukrainian soldiers in Kursk region if they surrender.