Russian President Vladimir Putin, center, and Exxon Mobil Corp. CEO Rex Tillerson shake hands at a signing ceremony of an agreement between state-controlled Russian oil company Rosneft and Exxon Mobil corporation at the Black Sea port of Tuapse, southern Russia, Friday, June 15, 2012. At left is CEO of state-controlled Russian oil company Rosneft Igor Sechin. (AP Photo/RIA-Novosti, Mikhail Klimentyev, Presidential Press Service)