What does the US naval blockade of Iran mean for oil prices?

The blockade threatens roughly 21 million barrels of daily oil flow through the Strait of Hormuz, per the US Energy Information Administration. Brent crude rose 2.4% in early April 13 trading, having already climbed from $78 to $104 per barrel since January 2026. A complete Hormuz closure, which the IRGC has threatened, could push Brent above $130, according to the Oxford Institute for Energy Studies.

Did the US blockade violate the ceasefire?

Yes, effectively. The April 7 ceasefire brokered through Pakistan was set to run through April 22. CENTCOM's blockade order on April 13 followed the collapse of talks in Islamabad on April 12. Iran's foreign ministry called the blockade "an act of war," and the IRGC warned that no regional port would be safe.

Which countries are most affected by a Hormuz blockade?

China imports approximately 1.7 million barrels of Iranian oil per day under a 2021 strategic cooperation agreement. South Korea, Japan, and India collectively account for nearly half of all Gulf crude imports, most of which transit the strait. Saudi Arabia and the UAE face the greatest revenue exposure among Gulf states; their combined East-West pipeline capacity of roughly 5 million barrels per day covers less than a quarter of normal export volumes.

What happens next after the Iran blockade?

The key date is April 22, when Trump's extended ceasefire was due to expire. The IAEA Board of Governors meets in Vienna on April 28 to assess Iran's nuclear compliance. Whether Iran agrees to new diplomatic terms or escalates — including possible Strait mining operations — will determine the conflict's trajectory in the weeks following.

US Blockade of Iranian Ports Begins

US Central Command activated a maritime blockade of all Iranian ports on April 13, 2026, after peace talks in Islamabad collapsed after 21 hours.

US Central Command ordered its naval forces to intercept all commercial vessels that have paid transit fees to Iran, effective 10:00 a.m. Eastern time on April 13, 2026 — the most significant maritime escalation in the US-Iran conflict since air and naval operations began February 28.

The blockade order followed the collapse of 21 hours of US-Iran negotiations in Islamabad, Pakistan. Vice President JD Vance announced on April 12 that Iran had "refused to accept Washington's terms," including a binding commitment to halt uranium enrichment above 20% and grant International Atomic Energy Agency inspectors unrestricted site access. President Donald Trump announced the measure on Truth Social within hours: "IRAN IS UNWILLING TO GIVE UP ITS NUCLEAR AMBITIONS!" CENTCOM specified that the order does not restrict freedom of navigation for vessels bound for non-Iranian ports — it targets ships that have directly paid tolls or docking fees to Iranian government or IRGC-controlled port authorities.

Iran's Islamic Revolutionary Guard Corps responded within two hours. "Security in the Persian Gulf and the Sea of Oman is either for everyone or for NO ONE," the IRGC said in a statement cited by Al Jazeera on April 13. "NO PORT in the region will be safe." Iran's foreign ministry separately called the blockade "an act of war" and summoned Pakistan's ambassador in Tehran to protest Islamabad's role as the negotiating venue.

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US Blockade of Iranian Ports Begins

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US Blockade of Iranian Ports Begins

Key Takeaways

Frequently Asked Questions

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