Chinese President Xi Jinping (front 2nd R) gives a speech during the opening ceremony of the G20 Leaders Summit whilst US President Barack Obama (front 2nd L), Russia's President Vladimir Putin (front R) and German Chancellor Angela Merkel (front L) listen 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/AFP/Getty Images