The U.S. Treasury has announced sanctions against two Chinese makers of drone engines and parts that the Biden administration says directly helped Russia build long-range attack drones used in the war in Ukraine.

The US has issued a series of sanctions against Chinese and Russian companies linked to the manufacturing of attack drones used in the Ukraine conflict.

Washington unveiled new sanctions Thursday targeting China-based companies linked to the production of drones that Russia has deployed in its war against Ukraine. It marks the first time the U.S. sanctioned Chinese companies “directly developing and producing complete weapons systems in partnership with Russian firms,

Limbach and Redlepus — have been working in tandem with IEMZ Kupol, a subsidiary of the Kremlin-owned weapons company Almaz-Antey, to create the drones, the U.S. Treasury Department's Office of Foreign Assets Control (OFAC) said in a statement.

Russia has launched 135 drones at Ukraine. Most of the targets were shot down by air defense, according to the Ukrainian Air Force. The Russians launched drones into Ukraine from Kursk, Orel, and Prymorsko-Akhtarsk.

The drone strikes occurred over the territory of the Ukrainian regions of Odesa and Kherson, Kyiv and Chernihiv, Cherkasy, Zhytomyr, Kirovohrad, and Poltava, Rivne, Chernivtsi, Khmelnytskyi, Volyn, Vinnytsia,

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,