Why is Trump looking to China to help open the Strait of Hormuz?

US president Donald Trump has called on numerous nations, including China, to help ships safely ‌transit the key Strait of Hormuz, where one-fifth of the world's oil transits on a daily basis. But why has Trump turned to Beijing, so often an adversary of the US and ally of Iran, for help? France 24's Olvier Farry takes a look.