Iran to set up Hormuz restricted zone, warns of stronger retaliation

The new restricted zone introduces additional shipping dangers to the Strait of Hormuz, a passage that previously carried a fifth of global oil supply. Broadening the areas where shipping can be sanctioned increases risks of tanker disruption and higher insurance, though US officials say transit volumes are still around two-thirds of what they were before the war. The direct warning of a "faster, heavier and more painful" reply to any new attacks keeps a geopolitical risk premium in oil prices, especially given the back-and-forth strikes since the weekend. Once the zone's boundaries and enforcement are published, traders will monitor them closely, as the premium's size depends on how much extra shipping area is affected.

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Despite the US holiday on Monday, Globex will open for oil trading at 6pm US Eastern time on Sunday (2200 GMT). Early foreign exchange rates can provide an early signal of sentiment changes regarding weekend news. So far, it is relatively calm despite Iran's rhetoric:

• Indicative forex prices at Monday open, 07 September 2026
• Iran warns of tougher response - oil, gold and stocks to watch over holiday weekend

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Iran is set to expand its sanctionable shipping area near Hormuz while its officials caution Washington that additional strikes will bring a much stronger response.

Key summary points:

• Iran's top security official announced a restricted zone will be declared outside the Strait of Hormuz in the coming days, starting at the line of the US Navy's blockade.
• Any vessel that enters the new zone will reportedly be placed on a sanctions list.
• Shipping passage maps for Hormuz, agreed with Oman, are to be signed soon.
• Parliament Speaker Mohammad Baqer Qalibaf stated that any future attack on Iran's interests will bring a faster, heavier and more painful response.
• This warning follows US strikes on three Iranian vessels after Iran's Revolutionary Guard launched ballistic missiles at two US Navy ships.
• A June ceasefire has collapsed, and tit-for-tat strikes have resumed after a pause for most of August.

According to Reuters, Iran plans to announce a new restricted area outside the Strait of Hormuz in the coming days, and its top security official cautioned that any ship entering the zone will be added to a sanctions roster. Mohsen Rezaei, head of Iran's Supreme National Security Council, said the area will start at the US Navy's blockade line and extend into sections of the Gulf, as reported by state media, and that shipping passage maps agreed with Oman are expected to be signed shortly.

This action accompanies a tougher rhetorical warning from Tehran. Parliament Speaker Mohammad Baqer Qalibaf declared the rules of the game had changed, informing the US that any future assault on Iran's interests and security "will receive a faster, heavier and more painful response." These remarks come after a new wave of hostilities: US Central Command reported it struck three Iranian vessels, one near Kharg Island, after Iran's Revolutionary Guard Corps launched ballistic missiles at two US Navy ships.

After six months of conflict, the situation is still deadlocked. A provisional ceasefire from June has fallen apart, and diplomatic attempts to restore it have advanced little. Attacks paused for most of August but have resumed in the last few days.

Iran still has the ability to threaten US interests in the region and to further limit traffic through Hormuz, a passage that transported a fifth of global oil supply before the war. US officials assert that Washington's own blockade is being enforced: Energy Secretary Chris Wright said transits are averaging more than 9 million barrels per day, which equates to about two-thirds of pre-war volumes when alternative pipeline routes are considered.

Whether Iran's new restricted area significantly increases that pressure will hinge on its exact borders and how tightly it is enforced after publication; those details were not available when the announcement was made.