The ruble headed for its biggest monthly decline since July amid a flight by investors unnerved by geopolitical tension following Russia’s imposition of sanctions against Turkey and a renewed sell off in oil. The ruble fell 0.3 percent to 66.650 as of 11:22 a.m. in Moscow, declining for a fourth day and extending its drop this month to 4.1 percent, the third-worst performance among expanded major currencies tracked by Bloomberg. Five-year government bonds fell for a second day, lifting the yield five basis points to 10.11 percent. Brent crude fell 0.5 percent to $44.62, the third day of declines. Russian President Vladimir Putin on Saturday suspended visa-free travel to Turkey, halted tours and banned hiring of Turkish nationals. The downing of Russia’s Su-24 plane by Turkey last Tuesday in northern Syria increased tensions in the region and soured optimism that the Paris terror attacks would result in improved cooperation […]