The G20 Summit

Russia's President Vladimir Putin, center foreground, gestures as he walks by U.S. President Barack Obama, front row second right, as he takes his place at a group photo outside of the Konstantin Palace in St. Petersburg, Russia, Sept. 6, 2013.

U.S. President Barack Obama, right, walks with Germany's Chancellor Angela Merkel prior to a group photo of G-20 leaders outside of the Konstantin Palace in St. Petersburg, Russia, Sept. 6, 2013. 

An image of U.S. President Barack Obama drinking out of a paper cup is shown on a large screen in the media center of a G-20 summit in St. Petersburg, Russia, Sept. 6, 2013. 

British Prime Minister David Cameron speaks during a media conference after a G-20 summit in St. Petersburg, Russia on Friday, Sept. 6, 2013.

Russian President Vladimir Putin (C) arrives for the family picture event during the G20 summit in St. Petersburg, Sept. 6, 2013.

U.S. President Barack Obama walks away after shaking hands with Russia's President Vladimir Putin during arrivals for the G20 Summit at the Konstantin Palace in St. Petersburg, Sept. 5, 2013.

U.S. President Barack Obama meets with Japanese Prime Minister Shinzo Abe at the G20 Summit in St. Petersburg, Sept. 5, 2013.

A man protests possible military action in Syria as the first day of the G20 Summit gets underway in St. Petersburg, Sept. 5, 2013.

BRICS leaders' at the G20 Summit in Strelna near St. Petersburg, Sept. 5, 2013.

Participants sit at a table during a BRICS leaders' meeting at the G20 Summit in Strelna near St. Petersburg, Sept. 5, 2013.

Apples are seen on the ground next to statues across the street from the Constantine Palace, the venue for a G20 meeting in St. Petersburg, Sept. 4, 2013.