MOSCOW - New US sanctions imposed on major Russian businesses and their owners sent Russian stocks and the ruble, the country's currency, sharply down on Monday, exchange data showed. Russia's benchmark RTS stock index was down 11.33 per cent at 04:20 p.m. According to data from Moscow Exchange, the ruble was at 59.11 against the dollar, down from $57.88 on Friday, after several months of relative stability, Xinhua reported.