As Barack Obama and Vladimir Putin argue over human rights in Russia and the fate of fugitive U.S. intelligence analyst Edward Snowden, the countries’ biggest oil companies are preparing to drill for giant oil discoveries together in the Arctic Ocean . Exxon Mobil Corp. (XOM) and OAO Rosneft (ROSN) are set to start their first Arctic well this year, targeting a deposit that may hold more oil than Norway ’s North Sea . It will kick off a series of landmark projects and cement an alliance begun in 2011. They also plan to frack shale fields in Siberia, sink a deep-water well in the Black Sea and build a natural gas-export terminal in Russia’s Far East. “We have a unique partnership,” Glenn Waller, Exxon’s Russian chief, said in an interview in Moscow. “They have the world’s biggest reserves and we have the largest market capitalization.” The deepening alliance shows […]