Russian President Vladimir Putin (L) meets with U.S. President Barack Obama on the sidelines of the G20 Summit in Hangzhou, China, September 5, 2016. Sputnik/Kremlin/Alexei Druzhinin/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. TPX IMAGES OF THE DAY (credit:Sputnik Photo Agency / Reuters)
CLIMATECHANGE-SUMMIT/(02 of10)
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Russian President Vladimir Putin (L) shakes hands with U.S. President Barack Obama as they meet during the World Climate Change Conference 2015 (COP21) at Le Bourget, near Paris, France, November 30, 2015. REUTERS/Mikhail Klimentyev/Sputnik/Kremlin ATTENTION EDITORS - THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. TPX IMAGES OF THE DAY (credit:Reuters Photographer / Reuters)
Russia US(03 of10)
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FILE _ This is a Tuesday, Nov. 11, 2014 file photo of Russian President Vladimir Putin, left, and U.S. President Barack Obama, as they talk on the sidelines of the Asia-Pacific Economic Cooperation (APEC) Summit in Beijing. Vladimir Putin\'s spokesman said Thursday Sept. 24, 2015, that the Russian president will meet with President Barack Obama on Monday. Putin is to speak to the United Nations General Assembly that day. It\'s not clear whether the meeting with Obama will take place before or after the speech. (AP Photo/RIA Novosti, Presidential Press Service, File) (credit:ASSOCIATED PRESS)
MEXICO/G20(04 of10)
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U.S. President Barack Obama (R) shakes hands with Russia\'s President Vladimir Putin in Los Cabos, Mexico, June 18, 2012. The leaders are in Los Cabos to attend the G20 summit. REUTERS/Jason Reed (MEXICO - Tags: POLITICS) (credit:Jason Reed / Reuters)
MEXICO/G20(05 of10)
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Russia\'s President Vladimir Putin (R) shakes hands with U.S. President Barack Obama during their meeting before the G20 summit in Los Cabos June 18, 2012. REUTERS/Aleksey Nikolskyi/RIA Novosti/Pool (MEXICO - Tags: POLITICS) THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS (credit:RIA Novosti / Reuters)
CHINA-APEC/(06 of10)
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Russian President Vladimir Putin (C) looks back at U.S. President Barack Obama (L) as they arrive with Chinese President Xi Jinping (R) at an Asia-Pacific Economic Cooperation (APEC) Summit plenary session at the International Convention Center at Yanqi Lake, in Beijing, November 11, 2014. REUTERS/Pablo Martinez Monsivais/Pool (CHINA - Tags: POLITICS BUSINESS TPX IMAGES OF THE DAY) (credit:POOL New / Reuters)
G20(07 of10)
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U.S. President Barack Obama and Russia\'s President Vladimir Putin (L) shake hands during the G20 summit at the Constantine Palace in St. Petersburg, September 5, 2013. REUTERS/Pablo Martinez Monsivais/Pool (RUSSIA - Tags: POLITICS) (credit:POOL New / Reuters)
OBAMA/(08 of10)
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U.S. President Barack Obama (L) meets with Russia\'s Prime Minister Vladimir Putin in Moscow, July 7, 2009. REUTERS/Jim Young (RUSSIA POLITICS) (credit:Jim Young / Reuters)
AP10ThingsToSee - President Barack Obama meets with Russian President Vladimir Putin in Enniskillen, Northern Ireland, Monday, June 17, 2013. Obama and Putin discussed the ongoing conflict in Syria during their bilateral meeting. (AP Photo/Evan Vucci, File) (credit:ASSOCIATED PRESS)
Mideast Syria Putins Moment Analysis(10 of10)
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FILE - In this June 18, 2012, file photo President Barack Obama and Russiaâs President Vladimir Putin, left, go to shake hands during their bilateral meeting at the G20 Summit in Los Cabos, Mexico. In a few days\' worth of opportunistic diplomacy, Vladimir Putin has revived memories of an era many thought long gone, where the United States and Soviet Union jostled for influence in a Middle East torn between two powers. Whatever happens with its proposal to relieve Syria of chemical weapons, Russia reemerges as a player in the region _ and one who does not easily abandon allies. That\'s meaningful in a region where America\'s dumping of Hosni Mubarak has emerged as a seminal moment _ and it may resonate with Iran, whose leaders are carefully watching the global chessboard as the clock ticks toward another showdown, over their nuclear program.(AP Photo/Carolyn Kaster, File) (credit:ASSOCIATED PRESS)