(L to R) Spain's Prime Minister Mariano Rajoy, US President Barack Obama and Indian Prime Minister Narendra Modi arrive for the opening ceremony of the G20 Leaders 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 / NICOLAS ASFOURINICOLAS ASFOURI/AFP/Getty Images

French President Francois Hollande (C) attends 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 / STEPHANE DE SAKUTINSTEPHANE DE SAKUTIN/AFP/Getty Images

French President Francois Hollande (front R) attends 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 / STEPHANE DE SAKUTINSTEPHANE DE SAKUTIN/AFP/Getty Images

Saudi Arabia's Deputy Crown Prince and Minister of Defense Muhammad bin Salman (L) and Japanese Prime Minister Shinzo Abe (C) 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

(L to R) French President Francois Hollande, Chinese President Xi Jinping, Russia's President Vladimir Putin and German Chancellor Angela Merkel arrive for the opening ceremony of the G20 Leaders 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 / NICOLAS ASFOURINICOLAS ASFOURI/AFP/Getty Images

(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

(L to R) French President Francois Hollande, Chinese President Xi Jinping, Russia's President Vladimir Putin and German Chancellor Angela Merkel arrive for the opening ceremony of the G20 Leaders 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 / NICOLAS ASFOURINICOLAS ASFOURI/AFP/Getty Images

German Chancellor Angela Merkel arrives at the Hangzhou 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 / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images