Russia's state-controlled gas company Gazprom CEO Alexei Miller, right,  and chairman of German natural-gas utility E.ON Rurhgas AG, Bernhard Reutersberg, left, sign an agreement at an investment forum in St. Petersburg, Russia, Friday, June 5, 2009. E.ON Rurhgas AG said on Friday it has signed a deal to complete the acquisition of a 25 percent stake in the Siberian Yuzhno Russkoye gas field from Gazprom OAO, wrapping up more than four years of preparation to co-own the strategic asset. AP Photo logo AP Photo 5 months ago

Russia's state-controlled gas company Gazprom CEO Alexei Miller, right, and chairman of German natural-gas utility E.ON Rurhgas AG, Bernhard Reutersberg, left, sign an agreement at an investment forum in St. Petersburg, Russia, Friday, June 5, 2009. E.ON Rurhgas AG said on Friday it has signed a deal to complete the acquisition of a 25 percent stake in the Siberian Yuzhno Russkoye gas field from Gazprom OAO, wrapping up more than four years of preparation to co-own the strategic asset.