The ruble headed for its longest streak of declines since May 2012 after OPEC effectively abandoned output limits, spurring concern Russia will struggle to emerge from a recession as low oil prices hurt revenue in the world’s biggest energy exporter. The Russian currency declined for a ninth day, losing 0.6 percent to 68.55 against the dollar by 10:28 a.m. in Moscow. The last time the ruble fell for as long was in May 2012, when the price of Brent sank 15 percent on concern China’s economy was slowing and as a debt crisis in Europe worsened. Fast-forward 3 1/2 years and the Organization of Petroleum Exporting Countries has pushed crude lower after ditching its long-time strategy of limiting production to control prices at meetings in Vienna on Friday. That’s adding to concern a global crude surplus will be protracted and increase Russia’s economic pain, where oil and natural gas […]