(L-R) French President Francois Hollande, Indonesia's President Joko Widodo, Chinese President Xi Jinping, Russia's President Vladimir Putin and German Chancellor Angela Merkel arrive for the opening ceremony of the G20 Leaders 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 / POOL / NICOLAS ASFOURINICOLAS ASFOURI/AFP/Getty Images