Russian stocks tumbled on Monday and the country’s currency sank against the dollar to its lowest level in 14 months as mounting tensions over a possible Russian invasion of Ukraine sparked investor fears of sanctions against Moscow. The risk-off sentiment initially pushed the MOEX Russia Index down over 7 percent intraday on Monday, with a relief rally clawing back some initial losses. By 9:12 a.m. New York time, the MOEX was down around 5 percent at 3233.85. After tumbling over 8.5 percent in early trading Monday, the Russian RTS Index was down around 6 percent by 9:17 a.m. New York time, trading at 1292.38. The Russian rouble dove over 2 percent against the U.S. dollar on Jan. 24 and by 8:55 a.m. New York time was trading at around 78.83 versus the greenback, its lowest level since November 2020. In a bid to curb the slide of the rouble and …