The United States and Britain took joint action on Friday to widen a ban on Russian metals imports in a bid to target the important Russian revenue source following its 2022 invasion of Ukraine. “This new action prohibits the import of Russian-origin aluminum, copper, and nickel into the United States,” the U.S. Treasury Department said in a statement. The action also limits the use of these metals on global metal exchanges and in over-the-counter derivatives trading, building on previous steps taken by the U.S. and U.K. governments. “Our new prohibitions on key metals, in coordination with ou…