The Chairman of the United States Senate Committee on Foreign Relations, Republican J. Risch, the Chairman of the Senate Armed Services Committee, Republican R. Wicker, and Republican Senators J. Kennedy and R. Scott appealed to US President D. Trump to use his powers regarding the $5 billion in Russian assets frozen in the United States in accordance with the REPO law, Ukrainian Ambassador to the U.S. Olha Stefanishyna reported on a Telegram channel on Thursday.