WASHINGTON (Reuters) – The United States on Tuesday imposed sanctions on companies it accused of being involved in the production of or transfer to Russia of Iranian drones that have been used in attacks on civilian infrastructure in Ukraine. The U.S. Treasury Department in a statement said it imposed sanctions on the Shahed Aviation Industries Research Center, accusing it of being responsible for the design and production of Shahed-series drones being used by Russian forces in Ukraine, as well as other companies. Russia has managed to procure drones from Iran that have been used to attack cit…