Iran ranks either third or fourth on known Oil/Gas reserves.
89% of its exports goes to China.
The Iranian oil industry is experiencing a marked decline in its ability to produce due to outdated technologies and other issues.
China at some point shall see their current supplier as being unable to provide the necessary amount of product and they shall be confronted with locating a reliable source for their energy needs.
Whether the Chinese decide to do "business" with the United States and find some sort of bargain where Iran gets a new government and China keeps their primary supplier and Western governments inject needed improvements in the Iranian Oil Industry cannot be ignored. The Chinese are known for being "businessmen" who also understand the art of the deal that benefit of agreements that avoid confrontation and War.
https://www.visualcapitalist.com/bre...ts-by-country/
Saudi Arabia on the other hand only exports about 5% of its oil to China.
https://wits.worldbank.org/CountryPr...ct/27-27_Fuels
When Iran threatens to block the Straits of Hormuz.....they might not really be able to do that unless they can continue their shipments to their largest customer....China.
Seems poor judgement by both Iran and China in reality.