From left, Wintershall's member of board of executive directors Harald Schwager, Gazprom CEO Alexei Miller, Russian Prime Minister Vladimir Putin and ENI's director general Paolo Skaroni congratulate each other after signing an agreement in the Black Sea resort of Sochi, on Friday, Sept. 16, 2011. On Friday in the presence of Russian Prime Minister Vladimir Putin shareholders and participants in South Stream gas pipeline Italy's ENI, France's EDF and Germany's Wintershall signed an agreement with Gazprom to take a fifty percent stake in the pipeline project. (AP Photo/Ivan Sekretarev)