Japan's Prime Minister Shinzo Abe arrives for 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 / POOL / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images

China's President Xi Jinping (L), Russia's President Vladimir Putin (2nd R) and Kazakhstan's President Nursultan Nazarbayev (R) walk with other G20 leaders and their spouses for a group picture prior to a dinner banquet at 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 / Johannes EISELEJOHANNES EISELE/AFP/Getty Images

Britain's Prime Minister Theresa May listens to Chinese President Xi Jinping (not pictured) speech during the opening ceremony of 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 / POOL/AFP/Getty Images

Singapore's Prime Minister Lee Hsien Loong listens to Chinese President Xi Jinping (not pictured) speech during the opening ceremony of 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 / POOL/AFP/Getty Images

Singapore's Prime Minister Lee Hsien Loong arrives for 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 / POOL / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images

IMF Managing Director Christine Lagarde arrives for 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 / POOL / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images

Kazakhstan's President Nursultan Nazarbayev (R) arrives for 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 / POOL / Etienne OliveauETIENNE OLIVEAU/AFP/Getty Images

US President Barack Obama (2nd L) talks with India's Prime Minister Narendra Modi (L) as G20 leaders and their spouses walk across the ground for a group picture prior to a dinner banquet at 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 / Johannes EISELEJOHANNES EISELE/AFP/Getty Images