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Russia's President Vladimir Putin invites President Obama before the main working session of the G20 Summit in Constantine Palace in Strelna, close St. Petersburg, September 2013. REUTERS/Grigory Dukor
Russian President Vladimir Putin glances back at President Obama as they land with Chinese President Xi Jinping at an APEC Summit entire session in Beijing, November 2014. REUTERS/Pablo Martinez Monsivais/Pool
President Obama shakes hands with Russian President Vladimir Putin amid their meeting at the United Nations General Assembly in New York, September 2015. REUTERS/Kevin Lamarque
President Obama conveys comments at the APEC pioneers' meeting in Beijing, November 2014. REUTERS/Pablo Martinez Monsivais/Pool
Russian President Vladimir Putin and President Obama share a toast amid the lunch meeting at the United Nations General Assembly in New York, September 2015. REUTERS/Mikhail Metzel/RIA Novosti/Pool
President Obama chats with Russia's President Vladimir Putin as they assemble for a family photograph toward the begin of the G20 summit in Antalya, Turkey, November 2015. REUTERS/Jonathan Ernst
President Obamo converses with his Russian partner Vladimir Putin amid the APEC Summit in Beijing, November 2014. REUTERS/Press administration of the president of the Russian Federation/RIA Novosti
President Obama converses with Russian President Vladimir Putin preceding the opening session of the Group of 20 Leaders summit in the Mediterranean resort city of Antalya, Turkey November 2015. REUTERS/Cem Oksuz/Pool
President Obama visits with Russia's President Vladimir Putin preceding a working session at the G20 in Antalya, Turkey, November 2015. REUTERS/Kayhan Ozer/Pool
Russian President Vladimir Putin meets with President Obama on the sidelines of the G20 Summit in Hangzhou, China, September 2016. Sputnik/Kremlin/Alexei Druzhinin/by means of REUTERS
President Obama meets with Russian President Vladimir Putin amid the G8 Summit at in Enniskillen, Northern Ireland, June 2013. REUTERS/Kevin Lamarque