Spain's Prime Minister Mariano Rajoy (L) and China's President Xi Jinping (R) shake hands prior to 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