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 neutralize 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.