Russia financial system shaken after U.S. imposes new sanctions The Washington PostNew US sanctions force end of dollar and euro trading on Russia’s main exchange CNNRussians Line Up To Buy US Dollars As Ruble Plummets After New Sanctions NewsweekRussia Suspends Dollar, Euro Trade on Flagship Stock Exchange The Wall Street JournalRussia, hit by new US sanctions, halts dollar and euro trade on main bourse Reuters