The Russian currency was buttressed by a recovery in oil prices, which erased overnight losses as investors moved into riskier assets and away from a U.S. dollar that tumbled to multi-year lows. The rouble has received a significant boost from a U.S. Federal Reserve announcement last month that the central bank would aim for 2% inflation on average instead of making it a fixed objective. The rouble has come under pressure recently from political risks linked to the crisis in Belarus and the suspected poisoning of Kremlin critic Alexei Navalny.