This year marks the 50th anniversary of the establishment of diplomatic relations between China and Iran. Earlier this year, the two countries signed a comprehensive cooperation plan to strengthen political, strategic and economic cooperation. What does this partnership with China mean for Iran, whose economy has been struggling under U.S. sanctions for decades? And how should the two countries respond to challenges brought by Western hostility? To find out more, we've invited Iran's ambassador to China Mohammad Keshavarz-Zadeh.