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Brazil's President Rousseff gestures next to India's Prime Minister Singh, Russia's President Putin, China's President Xi and South African President Zuma as they pose for a picture after a BRICS leaders' meeting at the G20 Summit in Strelna

Brazil's President Dilma Rousseff gestures next to India's Prime Minister Manmohan Singh, Russia's President Vladimir Putin, China's President Xi Jinping and South African President Jacob Zuma (L-R) as they pose for a picture after a BRICS leaders' meeting at the G20 Summit in Strelna near St. Petersburg, September 5, 2013. REUTERS/Sergei Karpukhin

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.