G20 Major Economies

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** FILE ** U.S. President Barack Obama, right, speaks with Russia's President Vladimir Putin during arrivals for the G-20 summit at the Konstantin Palace in St. Petersburg, Russia on Thursday, Sept. 5, 2013. (AP Photo/Alexander Zemlianichenko)

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President Obama during his news conference at the G-20 Summit in St. Petersburg, Russia, on Sept. 6, 2013. (Associated Press)

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President Obama pauses as he answers a question regarding the ongoing situation in Syria during his news conference at the G-20 Summit in St. Petersburg, Russia, on Sept. 6, 2013. (Associated Press)

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President Obama pauses as he answers a question regarding the ongoing situation in Syria during his news conference at the G-20 Summit in St. Petersburg, Russia, on Sept. 6, 2013. (Associated Press)

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** FILE ** Russia's President Vladimir Putin speaks during a media conference after a G-20 summit in St. Petersburg, Russia on Friday, Sept. 6, 2013. (AP Photo/Alexander Zemlianichenko)

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U.S. President Barack Obama, left, and China's President Xi Jinping, right, shake hands before their bilateral meeting at the G-20 Summit, Friday, Sept. 6, 2013 in St. Petersburg, Russia. (AP Photo/Pablo Martinez Monsivais)

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Syria was expected to be among the topics during the bilateral meeting between President Obama and Japan's Prime Minister Shinzo Abe at the G-20 Summit on Thursday. (Associated Press)

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Russian President Vladimir Putin speaks at a meeting with representatives of the G-20 Civil Summit at the Novo-Ogaryovo residence outside Moscow on Friday, June 14, 2013. (AP Photo/Yuri Kochertkov, Pool)