SOCHI, RUSSIA - AUGUST 30: Russian President, Vladimir Putin (R) and Rex Tillerson (L), Chairman and CEO of Exxon Mobil during a signing ceremony for an arctic oil exploration deal between Exxon Mobil and Rosneft on August, 30, 2011 in Sochi, Russia. US oil company Exxon Mobil have agreed an Arctic oil exploration deal with Russian state-owned oil company Rosneft, during a signing ceremony on Tuesday, attended by president Vladimir Putin. (Photo by Sasha Mordovets/Getty Images)

SOCHI, RUSSIA - AUGUST 30:  Russian President, Vladimir Putin (R) and Rex Tillerson (L), Chairman and CEO of Exxon Mobil during a signing ceremony for an arctic oil exploration deal between Exxon Mobil and Rosneft on August, 30, 2011 in Sochi, Russia. US oil company Exxon Mobil have agreed an Arctic oil exploration deal with Russian state-owned oil company Rosneft, during a signing ceremony on Tuesday, attended by president Vladimir Putin.  (Photo by Sasha Mordovets/Getty Images)