Thailand's Prime Minister Prayut Chan-O-Cha attends the opening ceremony of the G20 Summit at the International Expo Center 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