The chokepoint moves onto paper

Iran's Persian Gulf Strait Authority said on 23 August that vessels breaking its transit arrangements face fines, detention or seizure on later passages, and told cargo owners to check a list of non-compliant vessels before chartering a ship. Any vessel that works with a listed one, through a ship-to-ship transfer or a transshipment, joins the list itself. Scott Bessent is due to detail a new US sanctions round the following day.[1]

The enforcement point sits with the charterer rather than the hull. A list that has to be checked before a fixture pushes the risk into the contract and the insurance cover, where it is cheap for Tehran to impose and expensive for an owner to ignore, and Iran has to intercept nothing for the measure to bite. The other reading is narrower: the list may only write down what Iranian forces were already doing at sea, with seizures continuing at the same rate under a new name.[1]

Pricing the way around

Rezaei, who runs Iran's Supreme National Security Council, said neighbours joining the US economic campaign would find their own oil routes targeted and their interests treated as enemy interests. The traffic he is regulating has already thinned: about 20 million barrels a day crossed the strait before the war, the US Department of Energy puts current flows at 8 million to 9 million barrels a day, and MarineTraffic counted at least 6 vessels transiting in 24 hours.[1]

This column argued on 22 August that Iraq's barrels were moving through Hormuz on Tehran's permission, an account that rested on the state agency IRNA, granted case by case and tied to no published procedure. The list generalises that arrangement: what was an exception for one exporter becomes a standing rule every charterer has to price. Iraq owns no tanker fleet, so its exports depend on owners who now have a reason to refuse.[1], [2], [4]

The detour runs on a different map

On the same day, Shavkat Mirziyoyev and Ilham Aliyev signed a Treaty on Eternal Friendship in Tashkent and set a target of 1 billion dollars in bilateral trade by 2030, with a commitment to develop the Trans-Caspian corridor and a joint fleet on the Caspian. Transit freight between the two countries reached 1.4 million tonnes in 2025 and rose 12.2 per cent year on year to 675,000 tonnes in the first half of 2026.[3]

These two routes carry different cargo. The Caspian corridor moves containers and bulk while the strait moves crude, so 675,000 tonnes over six months relieves nothing that the fines and the seizures touch. The test is narrow and dated: if Tehran keeps enforcing through the list instead of closing the water outright, the daily transit count reported by MarineTraffic stays in single digits through 31 October 2026, and the corridor's tonnage keeps growing at roughly its current pace without moving that number.[3], [1]