A rare Sukhoi S-70 Okhotnik—the Russian air force’s first stealthy armed drone— got shot down apparently by an accompanying Russian fighter after the drone seemingly malfunctioned near the Ukrainian-held fortress town of Chasiv Yar in eastern Ukraine on Saturday.

Russia has stepped up drone attacks in recent weeks — for the first time since the full-scale invasion, they targeted cities and towns across Ukraine on a daily basis for an entire month in September.

The Treasury Department announced Thursday it was imposing sanctions for the first time on Chinese entities directly developing and producing drones that Russia is using in Ukraine. “Russia increasingly relies on the expertise of foreign professionals and the import of sophisticated technologies to sustain its weapons program and advance its military campaign against Ukraine,