Russia's Prime Minister Vladimir Putin (L) speaks with ExxonMobil President and Chief Executive Officer Rex Tillerson during the signing of a Rosneft-ExxonMobil strategic partnership agreement in Sochi on Aug. 30, 2011. Russia's oil champion Rosneft and US ExxonMobil clinched a global deal worth up to half-a-trillion dollars that will see the US supermajor take BP's place in pioneering Arctic exploration work.
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