The U.S. Treasury Department announced new sanctions Thursday on a China-based network that sells aerospace components to Iran for manufacturing drones.

The Iran Aircraft Manufacturing Industrial Company manufactures the Shahed-136 drones and exports them to Russia, which has increasingly used them to bombard Ukraine in recent months.

"Iran is directly implicated in the Ukrainian civilian casualties that result from Russia’s use of Iranian UAVs (unmanned aerial vehicle), in Ukraine," said Brian Nelson, the Treasury Department's undersecretary for Terrorism and Financial Intelligence, in a statement on Thursday. "The United States will continue to target global Iranian procurement networks that supply Russia with deadly UAVs for use in its illegal war in Ukraine."

Iranian drone

Iranian drones have been used by Russia to strike Ukrainian civilian structures and critical infrastructure. (Reuters / Roman Petushkov / File)

Five Chinese companies and one individual were sanctioned for sending thousands of aerospace components to Iran.

Iranian drones have been used by Russia to strike Ukrainian civilian structures and critical infrastructure. 

Iranian drone

American officials are calling attention to Russia's usage of Iranian equipment in its war on Ukraine. (Ukrainian military's Strategic Communications Directorate via AP / File)

US SLAPS NEW SANCTIONS ON RUSSIA OVER UKRAINE WAR, RAISES TARIFFS

White House National Security Advisor Jake Sullivan warned earlier this year that Iran "could potentially be contributing to widespread war crimes" by supplying Russia with drones to bombard Ukraine.

"Their weapons are being used to kill civilians in Ukraine and to try to plunge cities into cold and darkness," Sullivan said in January.

Iranian drone parts

A police officer inspects parts of an unmanned aerial vehicle, which Ukrainian authorities deemed an Iranian-made suicide drone, in Kharkiv, Ukraine, on Oct. 6, 2022. (Reuters / Vyacheslav Madiyevskyy)

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U.S. officials have even accused Iran of sending personnel to Crimea to train Russian troops on how to pilot the drones.

"They can lie to the world, but they certainly can't hide the facts, and the fact is this: Tehran is now directly engaged on the ground," National Security Council spokesperson John Kirby said last fall.

Fox News Digital's Greg Norman contributed to this report.