On Feb. 25, an elite Russian drone group—the Rubicon Center of Advanced Unmanned Systems—launched a devastating wave of attacks on the main supply line supporting the Ukrainian garrison in Sudzha, the center of the Ukrainian-held salient in western Russia’s Kursk Oblast.

Analyst David Axe described the situation of Ukrainian armed forces in the Kursk region on the Forbes portal. According to his calculations, they may have lost about 500 vehicles and artillery pieces there.