The ruble fell toward a six-month low amid renewed weakness in oil prices, threatening to end the Russian central bank’s series of interest-rate cuts aimed at reviving the economy. The currency slid 0.5 percent to 65.3010 per dollar by 4:32 p.m. in Moscow, dropping for a third day. The ruble has lost a quarter of its value since reaching this year’s peak on May 18 as the central bank stepped up foreign-currency purchases to build reserves. Brent crude fell 0.1 percent to $49.15 a barrel on Monday, trading below $50 for the third day after entering a bear market last month. Russia’s economy is heading for an estimated 3.6 percent contraction this year, hemmed in by lower oil prices and international sanctions tied to its role in the Ukraine conflict. Policy makers have reduced the benchmark interest rate five times by a total of 6 percentage points since making […]