WASHINGTON (Reuters) - U.S. Senate Democratic Leader Chuck Schumer said on Saturday he will force a vote soon on a resolution to disapprove the Trump administration's decision to relax sanctions on three Russian companies connected to oligarch Oleg Deripaska…{snip} ...The U.S. Treasury announced on Dec. 20 that it would lift sanctions imposed in April on the core businesses of Deripaska, including aluminum giant Rusal its parent En+ and power firm EuroSibEnergo, watering down the toughest penalties imposed since Moscow's 2014 annexation of Crimea. After lobbying by European governments that followed the imposition of sanctions, Washington postponed enforcement of the sanctions...