(Front L to R) Indonesian President Joko Widodo, French President Francois Hollande, Chinas President Xi Jinping, Russian President Vladimir Putin, German Chancellor Angela Merkel and South African President Jacob Zuma arrive for the opening ceremony of 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 / POOL / Mark SchiefelbeinMARK SCHIEFELBEIN/AFP/Getty Images