French President Francois Hollande (R) and Russian President Vladimir Putin (L) during the G20 Leaders Summit in Hangzhou, in China's eastern Zhejiang province 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 / STEPHANE DE SAKUTINSTEPHANE DE SAKUTIN/AFP/Getty Images