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U.S. President Obama shakes hands with Japanese PM Abe at the G20 Summit in St. Petersburg

U.S. President Barack Obama (L) shakes hands with Japanese Prime Minister Shinzo Abe at the G20 Summit in St. Petersburg, Russia September 5, 2013. REUTERS/Kevin Lamarque

World leaders meet at G20 summit

World leaders from G20 are meeting in St Petersburg, Russia, with the crisis in Syria high on the agenda.