The ruble’s movements are the closest to those of oil prices in 20 months as a series of Russian interest-rate cuts and central bank currency purchases damp its carry-trade appeal. The Russian currency fell for a third day, losing 1.6 percent to 52.8 versus the dollar as of 7:02 p.m. in Moscow, the weakest since April 22. The correlation between changes in the ruble-dollar exchange rate and moves in the price of Brent rose to 36 percent, the most since September 2013, according to data compiled by Bloomberg. “The ruble is now following the dollar’s move against other currencies and oil, which is also tracking the dollar,” Andrey Mishko, a foreign-currency trader at National Standard Bank in Moscow, said in e-mailed comments. “On top of that, the central bank is buying, making the overall market positioning long dollar.” The ruble has pared its world-leading performance this year to 15 […]