ST. PETERSBURG,RUSSIA,SEPTEMBER 5: Russian President Vladimir Putin welcomes US President Barack Obama (R) for the G20 summit which will take place from 5 to 6 September in Saint Petersburg. The leaders of the most developed 20 countries of the world will discuss economic issues during the two-day summit, focusing mainly on tax reforms. Developments in Syria are also expected to be covered extensively, in addition to the formal agenda. (Photo by Volkan Furuncu/Anadolu Agency/Getty Images)
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