Spain's Prime Minister Mariano Rajoy (L) speaks to Chinese President Xi Jinping (not pictured) during their meeting on the sidelines of the G20 Summit at the West Lake State Guest House in Hangzhou on September 5, 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 / HOW HWEE YOUNGHOW HWEE YOUNG/AFP/Getty Images

Chinese President Xi Jinping (C) speaks to Spain's Prime Minister Mariano Rajoy (not pictured) during their meeting on the sidelines of the G20 Summit at the West Lake State Guest House in Hangzhou on September 5, 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 / HOW HWEE YOUNGHOW HWEE YOUNG/AFP/Getty Images

French President Francois Hollande (L) shakes hands with Egypt's President Abdel Fattah al-Sisi (R) at a sideline meeting on the G20 Summit in Hangzhou on September 5, 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 (L) shakes hands with Egypt's President Abdel Fattah al-Sisi (R) at a sideline meeting on the G20 Summit in Hangzhou on September 5, 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 (L) shakes hands with Egypt's President Abdel Fattah al-Sisi (R) at a sideline meeting on the G20 Summit in Hangzhou on September 5, 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 (L) greets Egypt's President Abdel Fattah al-Sisi (R) at a sideline meeting on the G20 Summit in Hangzhou on September 5, 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 (R) speaks to South Korean President Park Geun-hye (not pictured) during their meeting on the sideline of the G20 Summit at the West Lake State Guest House in Hangzhou on September 5, 2016. G20 leaders meet in China under pressure to reboot the world economy, after host leader Xi Jinping warned against "empty talk" and a rising mood of protectionism that threatens globalisation and free trade. / AFP PHOTO / POOL / HOW HWEE YOUNGHOW HWEE YOUNG/AFP/Getty Images

Chinese President Xi Jinping (R) speaks to South Korean President Park Geun-hye (L) during their meeting on the sideline of the G20 Summit at the West Lake State Guest House in Hangzhou on September 5, 2016. G20 leaders meet in China under pressure to reboot the world economy, after host leader Xi Jinping warned against "empty talk" and a rising mood of protectionism that threatens globalisation and free trade. / AFP PHOTO / POOL / HOW HWEE YOUNGHOW HWEE YOUNG/AFP/Getty Images