The Strait Opens As Iran's Economy Closes

Oil is moving through the Strait of Hormuz again. But while the world adjusts to the blockade, Iran faces mounting isolation by sea, air and through its banking system.

Three Weeks Can Make a Difference

In my 31 August article, Are the Straits of Hormuz Open?, I estimated that Gulf oil exports had recovered to around 15–16 million barrels per day, including shipments through the Strait and pipelines bypassing it.

That was a substantial recovery from the March collapse, but still well below the pre-war flow of roughly 21 million barrels a day through Hormuz alone.

September has demonstrated just how fragile that recovery remains.

Attacks on Saudi Arabia's East-West pipeline and another tanker incident in Hormuz sent oil prices climbing. On 17 September, Brent closed at US$104.82 a barrel.

Then the news changed. Gulf shipments increased, Saudi Arabia moved to restore its pipeline, and reports emerged of possible renewed negotiations with Iran. On 22 September, Brent briefly fell below US$98 before recovering.

The market is reacting to something more substantial than diplomatic speculation.

Oil is getting through.

Hormuz: The Latest Numbers

On 21 September, US Central Command reported that oil shipments through Hormuz had reached a six-month high. It said US naval operations had helped move more than one billion barrels of Gulf oil in recent months.

Saudi exports through the Strait have reportedly reached as much as 2.4 million barrels per day over the preceding fortnight.

These developments confirm the direction of travel, although they do not establish a precise current total for all oil passing through Hormuz. Military-reported movements, commercial tanker tracking and exports through bypass pipelines measure different things.

Hormuz shipments: six-month high reported on 21 September. Normal pre-war traffic has not been fully restored.

The distinction matters. Hormuz remains dangerous, and attacks on shipping and alternative export routes can still disrupt supplies. But it is no longer accurate to describe the Gulf's oil exports as paralysed.

Iran: A Modern Economic Siege

For Iran, however, the picture is moving in the opposite direction.

The US naval blockade, reinstated in July, has severely restricted Iranian oil exports. Reuters reported that crude loadings fell from around two million barrels per day in March to approximately 220,000–255,000 barrels per day in August. For seven weeks, no meaningful Iranian crude exports had passed through Hormuz.

Iranian crude loadings collapse

Approximate barrels per day, March and August 2026. (Figures reported by Reuters.)

Oil is only one part of the pressure.

By sea: The blockade has sharply restricted Iran's access to its principal oil customer, China. Oil held in floating storage abroad has provided a temporary source of supply, but without fresh shipments that reserve diminishes.

By air: On 8 September, the US Treasury sanctioned 36 targets associated with Iranian aviation. International services have subsequently been cancelled or suspended, including Mahan Air flights to Istanbul, Ankara and Muscat. New restrictions on refuelling, ground handling and ticket sales threaten the remaining international operations.

Through the banks: On 18 September, Turkey revoked the operating licence of Bank Mellat's Istanbul branch. The move followed increased US pressure on financial institutions dealing with Iran, further narrowing its international banking options.

Iran has responded by shifting more trade overland, particularly through Turkey. But congested border crossings, higher transport costs and difficulties making international payments limit how much these routes can replace maritime trade.

This is not complete isolation. Iran retains trading relationships, land borders and diplomatic contacts. But the combined pressure on its shipping, aviation and financial systems is making international commerce progressively more difficult.

And ordinary Iranians are bearing substantial costs alongside the government: higher prices, fewer travel options and increasing difficulties obtaining imported goods.

The Pressure — and the Unanswered Question

Iran has responded to the blockade with threats against shipping and continued resistance to US demands. Yet on 22 September, a senior Iranian official indicated that Tehran could reopen Hormuz within a week if Washington eased military pressure and lifted the blockade.

The proposal has not produced an agreement.

The economic pressure is measurable. Whether it will produce a negotiated settlement, prolonged confrontation or further escalation remains unresolved.

For the rest of the world, the immediate story is improving oil flows and easing prices.

For Iran, it is the steady contraction of its economic connections.

The Strait is becoming more accessible to Gulf oil. Iran's own route to world markets is becoming harder to use.

That is the striking contrast since our last report.

I would use this as the article draft and hold the cartoon, search description and X posts until you are happy with the text. The most useful continuing indicator will be the gap between total Gulf oil shipments and Iran's own exports, rather than oil prices alone.