Mexico's President Enrique Pena Nieto walks down the stairs as he arrives a day before the G20 Summit in St. Petersburg, September 4, 2013. The Group of 20 cut its teeth in the global financial crisis... more 
Mexico's President Enrique Pena Nieto walks down the stairs as he arrives a day before the G20 Summit in St. Petersburg, September 4, 2013. The Group of 20 cut its teeth in the global financial crisis of 2009, achieving unprecedented cooperation between developed and emerging nations to stave off economic collapse which has not been matched since. REUTERS/Alexander Vilf/RIA Novosti/Pool (RUSSIA - Tags: POLITICS BUSINESS) ATTENTION EDITORS - THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less 
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Reuters | Photo By RIA NOVOSTI / REUTERS
Wed, Sep 4, 2013 8:16 AM EDT