US President Barack Obamas (L) speaks to French President Francois Hollande (R) on 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 / JOHANNES EISELEJOHANNES EISELE/AFP/Getty Images