South Korean President Park Geun-hye (L) shakes hands with Chinese President Xi Jinping prior to 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

South Korean President Park Geun-hye (2ndL) listens as Chinese President Xi Jinping (not pictured) speaks 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

South Korean President Park Geun-hye (L) shakes hands with Chinese President Xi Jinping prior to 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

South Korean President Park Geun-hye (R) walks past Chinese President Xi Jinping prior to 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

British Prime Minister Theresa May (2nd R) meets Australian Prime Minister Malcolm Turnbull (not pictured) during a bilateral meeting on the sidelines of G20 Summit 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 / ALY SONGALY SONG/AFP/Getty Images

Australian Prime Minister Malcolm Turnbull (2nd L) meets British Prime Minister Theresa May (not pictured) during a bilateral meeting on the sidelines of G20 Summit 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 / ALY SONGALY SONG/AFP/Getty Images

British Prime Minister Theresa May (R) shakes hands with Australian Prime Minister Malcolm Turnbull during a bilateral meeting on the sidelines of G20 Summit 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 / ALY SONGALY SONG/AFP/Getty Images

British Prime Minister Theresa May (R) shakes hands with Australian Prime Minister Malcolm Turnbull during a bilateral meeting on the sidelines of G20 Summit 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 / ALY SONGALY SONG/AFP/Getty Images