Mexico's President Enrique Pena Nieto ( 3rd L) meets with Chinese President Xi Jinping (R) at the West Lake State Guest House in Hangzhou on September 4, 2016. G20 leaders confront a sluggish global economy and the winds of populism as they open annual talks, but the long war in Syria and the South China Sea territorial dispute hang over the summit in the scenic city of Hangzhou. / AFP PHOTO / POOL / WANG ZHAOWANG ZHAO/AFP/Getty Images