China's President Xi Jinping (L), Russia's President Vladimir Putin (2nd R) and Kazakhstan's President Nursultan Nazarbayev (R) walk with other G20 leaders and their spouses for a group picture prior to a dinner banquet at the G20 Summit 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. / AFP PHOTO / Johannes EISELEJOHANNES EISELE/AFP/Getty Images