OAO Gazpromneft fell to a three-week low, leading declines in U.S.-traded Russian energy companies as crude prices tumbled for a fourth day. The state-controlled oil company dropped 6.4 percent to $11.36 in New York. The stock contributed the most to a 1.2 percent retreat in the Bloomberg Russia-US Equity Index. OAO Lukoil (LUKOY) , the nation’s biggest non-government oil producer and OAO Surgutneftegas (SGTPY) each declined more than 3 percent. Oil, the country’s biggest export, continued its slide after the worst annual drop since 2008 on speculation expanding U.S. inventories will worsen a global supply glut. Brent crude , the grade traders use to price Russia’s main export blend, sank 3.8 percent to $51.10, the lowest since April 2009. Energy Ministry data released last week showed Russian producers boosted output to a post-Soviet record of 10.667 million barrels a day in December. “For the economy, investors and business in […]