Russia’s central bank has more than doubled its key interest rate and taken emergency capital control measures to try stem the collapse of its currency and shore up financial stability as tough Western sanctions over the Kremlin-ordered invasion of Ukraine sent the ruble plummeting. The Bank of Russia, the country’s central bank, on Feb. 28 announced it had raised the benchmark interest rate from 9.5 percent to a whopping 20 percent to stabilize markets and boost the falling ruble. “External conditions for the Russian economy have drastically changed,” the Bank of Russia said in a Feb. 28 statement, adding that the rate hike “will ensure a rise in deposit rates to levels needed to compensate for the increased depreciation and inflation risk.” The Russian ruble was trading at around 101 versus the U.S. dollar by 5:18 a.m. New York time, a decline of some 16.5 percent intraday. Moscow is also poised to …