Washington Tuesday imposed sanctions on companies and people it accused of being involved in the production or transfer of Iranian drones that have been used by Russia in attacks on civilian infrastructure in Ukraine.

Russia has procured drones from Iran that have been used to attack cities and power infrastructure in Ukraine.

Iran has acknowledged that it had supplied Moscow with drones but said they were sent before the war in Ukraine.

"As we have demonstrated repeatedly, the United States is determined to sanction people and companies, no matter where they are located, that support Russia's unjustified invasion of Ukraine," Treasury Secretary Janet Yellen said in the statement.

"Today's action exposes and holds accountable companies and individuals that have enabled Russia's use of Iranian-built UAVs to brutalize Ukrainian civilians," she said.

The US Treasury Department, in a statement, said it imposed sanctions on the Shahed Aviation Industries Research Center, which it said was subordinate to Iran's Revolutionary Guard Corps (IRGC) Aerospace Force, accusing the firm of being responsible for the design and production of Shahed-series drones being used by Russian forces in Ukraine.

Also designated were United Arab Emirates air transportation firms Success Aviation Services FZC and iJet Global DMCC, which the Treasury accused of collaborating with an Iranian firm under US sanctions to coordinate flights between Iran and Russia, including those tied to transporting Iranian drones.

Treasury said the action against the two companies was taken in cooperation with the government of the United Arab Emirates.

Tuesday's move freezes any US assets of those designated and generally bars Americans from dealing with them.

Reuters report