Iran plans restricted zone in Strait of Hormuz, heightening shipping tensions

Iran has announced plans to establish a new restricted zone in the Strait of Hormuz, a critical global energy chokepoint, following a dangerous escalation in hostilities with the United States. Tehran’s Supreme National Security Council Secretary, Mohsen Rezaei, stated that the zone will begin at the line of the current US naval blockade and extend into the Persian Gulf. Any vessel entering this designated area will be placed on Iran’s sanctions list. This move comes after a sixty-day memorandum of understanding, signed on June 17 to halt military clashes, expired last month without renewal. The collapse of the agreement was driven by unresolved disputes over control of the strait, which Iran has increasingly used as leverage in its broader conflict with Washington. The announcement marks a significant shift in tactics, moving from sporadic attacks to a formalized attempt to control maritime traffic through unilateral decree.

The context for this escalation is a deteriorating security environment in the Gulf. Since the expiration of the truce, both sides have engaged in on-and-off attacks on shipping. Iran has targeted US warships that are patrolling the waters and escorting oil tankers attempting to avoid the Iranian-imposed blockade. In response, the United States has maintained a naval blockade of Iranian ports, severely restricting Tehran’s ability to export oil and conduct other trade. Prior to the outbreak of war, approximately twenty percent of the world’s oil and gas supplies flowed through the Strait of Hormuz. Now, the waterway has become a frontline in the wider US-Israel conflict with Iran. Tehran has repeatedly warned vessels against using unauthorized routes, citing security concerns as the number of oil tankers passing through the strait grows. The situation has created a volatile mix of military posturing and economic pressure, with both nations using control of the seas as a strategic weapon.

Details regarding the enforcement and precise boundaries of the new zone remain vague. Rezaei indicated that specific maps detailing approved routes, developed in conjunction with Oman, would be approved and signed in the coming days. He described the new international corridor as lying within Iranian and Omani waters, with Iran retaining management authority. Deputy Foreign Minister Kazem Gharibabadi previously confirmed that Iran and Oman had agreed on a temporary maritime route for ships, with entry and part of the exit route passing through Iranian territorial waters. However, it is unclear what practical consequences facing the Iranian sanctions list would have for international shipping companies. The lack of clarity on enforcement mechanisms raises questions about how Tehran intends to physically prevent unauthorized vessels from entering the zone without triggering a direct naval confrontation.

The international reaction to the announcement has been muted so far, with no immediate response from Washington or other major powers specifically addressing the new restricted zone. However, the US rejected an Iranian claim reported in local media regarding the situation, signaling continued diplomatic friction. Rezaei made it clear that Iran will only commit to keeping the Strait of Hormuz fully open if the United States stops what it describes as sabotage, threats, and attacks against Iran. This conditional stance suggests that the restricted zone is not just a security measure but a political tool designed to force a change in US policy. As the world relies heavily on the free flow of energy through this narrow waterway, the inability to reach a new agreement risks further destabilizing global energy markets. The coming days will be critical in determining whether this new zone results in a de facto closure of the strait or a negotiated return to safer shipping practices.