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U.S. President Barack Obama waves as he arrives to take part in the G20 Summit in St. Petersburg

U.S. President Barack Obama waves as he arrives to take part in the G20 Summit in St. Petersburg, September 5, 2013. REUTERS/Alexander Demianchuk

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.