On Tuesday, two tankers were attacked as they transited the Strait of Hormuz via a passage in Omani waters. Gulf countries responded by sharply condemning the attacks and blaming Iran. The United States then launched attacks on Iranian territory, to which Tehran responded by striking Bahrain and Kuwait. US President Donald Trump has now said the memorandum of understanding (MoU) that Iran and the US signed is void.

This latest escalation illustrates how the Strait of Hormuz has become the central issue in the US-Israel war with Iran that began on February 28. Disagreements over the strait’s future have proven to be the hardest to resolve in the US-Iranian negotiations, as questions about Iran’s nuclear programme have been put to the side.

The disruption of traffic in the Strait of Hormuz has an immediate and costly price tag attached, for Iran, for its Gulf neighbours, and for a global economy that has spent four and a half months absorbing the largest oil supply shock in the history of the modern market.

Iran’s leverage is also its liability

For Tehran, the strait is its strongest card – one that is also incredibly costly. Since the war began, Iranian forces have mined the strait, attacked vessels and cut traffic through the passage by roughly 95 percent. This has led to what the International Energy Agency’s Fatih Birol has called “the largest supply disruption in the history of the global oil market”.

That leverage is real: about a fifth of the world’s oil and a fifth of its liquefied natural gas (LNG) normally move through Hormuz, and no amount of Gulf pipeline capacity can fully replace it.

But Iran has effectively been strangling its own lifeline along with everyone else’s. Iranian crude, once sold for $3 a barrel less than international benchmarks, is now selling at a 20 percent discount. The country’s oil exports collapsed by more than 90 percent in May as US naval enforcement squeezed its shadow........

© Al Jazeera