Iran has closed the Strait of Hormuz, the narrow waterway that carries about a fifth of the world's oil, in response to Israeli attacks on Lebanon. The move, announced by Iranian authorities, threatens to disrupt global energy supplies and ratchet up tensions across the Middle East.
Why the strait matters
The Strait of Hormuz connects the Persian Gulf to the Gulf of Oman and the open sea. Roughly 20 million barrels of crude oil and petroleum products pass through it each day. That's roughly a third of all seaborne oil trade. For countries like Japan, India, South Korea, and China, the strait is the main route for oil imports from Saudi Arabia, Iraq, Kuwait, and the United Arab Emirates. A closure — even a short one — can send crude prices spiking and force nations to tap strategic reserves.
The trigger: Israeli strikes on Lebanon
Iran's decision came hours after Israeli warplanes hit targets in Lebanon. The attacks, which Israel said were aimed at Hezbollah positions, killed at least a dozen people, according to Lebanese officials. Tehran, which backs Hezbollah, condemned the strikes and called the closure a defensive measure. There was no immediate statement from the Israeli government on Iran's move.
Global economic fallout
Oil futures jumped 8% in early Asian trading on the news. Analysts at Goldman Sachs warned that a prolonged closure could push Brent crude above $120 a barrel — a level not seen since 2022. The United States has urged restraint on all sides, but the White House has not said whether it will deploy naval assets to reopen the waterway. The International Energy Agency said it stands ready to coordinate a release of emergency oil stocks if needed.
Geopolitical risks mount
The closure risks dragging the region into a wider conflict. Iran's military has previously threatened to mine the strait and use anti-ship missiles to block passage. The U.S. Fifth Fleet, based in Bahrain, has conducted regular patrols there for decades. Any confrontation between Iranian forces and American warships would mark a serious escalation. Diplomatic efforts are underway — the UN Security Council is set to meet later this week — but no breakthrough appears close.
For now, the strait is closed. Shipping companies are rerouting vessels around the Cape of Good Hope, adding weeks to transit times and driving up freight costs. Oil markets will be watching for Iran's next move — and for any sign that the blockade can be lifted before the global economy feels the full weight of the disruption.
