Iran's foreign minister warned earlier Sunday that the Islamic Republic "reserves all options to defend its sovereignty" after U.S. airstrikes.

US Secretary of State Marco Rubio has called on China to prevent Iran from closing the Strait of Hormuz, one of the world's most important shipping routes. His comments came after Iran's state-run Press TV reported that their parliament had approved a plan to close the Strait but added that the final decision lies with the Supreme National Security Council.

As tensions rise further in the Gulf following Iranian threats to close the Strait of Hormuz, how likely is China to act on US calls to rein in Tehran?