The United States has imposed sanctions on four Iranian entities and one individual for their alleged involvement in providing drones to Russia.
The US Treasury Department made the announcement on Thursday. Those targeted by the sanctions will have their property and interests in the US frozen.
The Treasury said one of the four entities, Paravar Pars Company, is closely associated with Imam Hossein University, which is controlled by Iran's Islamic Revolutionary Guard Corps.
It accused the firm of producing and testing Unmanned Aerial Vehicles, or UAVs, for the IRGC.
The Treasury also said Tehran-based Safiran Airport Services has coordinated Russian military flights between Iran and Russia, including those associated with transporting Iranian UAVs, personnel and related equipment from Iran to Russia.
A senior Treasury official said, "The United States is committed to strictly enforcing our sanctions against both Russia and Iran and holding accountable Iran and those supporting Russia's war of aggression against Ukraine."