The Trump administration’s decision to carry out a naval blockade of the Strait of Hormuz has raised tensions in the Persian Gulf to new and more perilous levels. The move was announced by the US president, Donald Trump, after negotiations over a ceasefire with Iran broke down on April 11, partly due to Iran wanting to retain control of the vital Strait of Hormuz, through which one-fifth of the world’s oil transits.

The blockade is designed to neutralise Iran’s efforts to close the strait to shipping it deems unfriendly to Tehran and implement a toll system for other vessels transiting the strait.

The US blockade can be seen as the latest attempt by the Trump administration to project strength. But it also throws down a challenge to Beijing. China has been the main purchaser of Iranian oil in recent years and is one of the few nations whose shipping can enter the strait unchallenged.

It appeared very likely that this status would be tested on April 14 when the Rich Starry, a Chinese owned and operated tanker under US sanction for transporting Iranian oil, transited the strait unchallenged by the US warships in the region.

But it has since been reported that the vessel turned back in the Gulf of Oman and headed back to the Strait of Hormuz. The US now claims that six vessels that attempted to transit the strait were turned around.

The Rich Starry’s willingness to avert a potential Sino-American clash,........

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