China's President Xi Jinping (C) flanked by US President Barack Obama (L) and Russia's President Vladimir Putin (R) delivers a speech during 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

Chinese President Xi Jinping (C) gives a speech during the opening ceremony of the G20 Leaders Summit whilst US President Barack Obama (L) and Russia's President Vladimir Putin (R) listen 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

Kazakhstan's President Nursultan Nazarbayev (2nd L) and Turkey's President Recep Tayyip Erdogan (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

Chinese President Xi Jinping (C) gives a speech during the opening ceremony of the G20 Leaders Summit whilst US President Barack Obama (L) and Russia's President Vladimir Putin (R) listen 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

Brazil's President Michel Temer arrives 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 / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images

Brazil's President Michel Temer arrives 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 / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images

German Chancellor Angela Merkel (L) talks with US President Barack Obama (R) during 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

IMF Managing Director Christine Lagarde (L), British Prime Minister Theresa May (C) and President of the European Commission Jean-Claude Juncker (R) arrive for the opening ceremony of the G-20 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