Iran Closes Strait of Hormuz, Shattering Fragile Ceasefire

Iran’s Khatam al-Anbiya Central Headquarters announced on June 20, 2026, that the Strait of Hormuz is closed to vessel traffic. The command cited alleged violations of the Islamabad Memorandum of Understanding by the United States and Israel.

This declaration directly challenges the recent de-escalation framework and reintroduces risks to global oil transit at a moment when markets had priced in relief.

The Military Command’s Statement

The Khatam al-Anbiya Central Headquarters, Iran’s top joint operational command, described the closure as the “first step” and warned of additional measures if aggression continues.

Iranian state media carried the announcement. The move follows months of conflict that began with U.S. and Israeli strikes in late February 2026 and earlier restrictions on the strait.

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The Strait carries approximately 21 million barrels per day of oil and petroleum liquids. This volume equals roughly 20% of global petroleum liquids consumption and about one-quarter of seaborne oil trade, according to U.S. Energy Information Administration data.

The waterway also handles major liquefied natural gas exports from Qatar and the UAE. Disruptions here have historically amplified price volatility because few viable bypass routes exist for Gulf producers.

Tension with the Islamabad MOU

The 14-point Islamabad Memorandum of Understanding, reached around June 17, 2026, included commitments for Iran to make best efforts toward safe, toll-free commercial passage for an initial 60-day period.

It also called for an end to the U.S. naval blockade of Iranian ports. Traffic had begun resuming after the framework, contributing to lower energy prices.

The latest military statement undercuts those passage provisions and frames continued Israeli actions in Lebanon as breaches.

The MOU, which had pushed oil prices lower, could see renewed interest in hopes of a prolonged supply shock.

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