Tehran and Muscat open a working group on Hormuz — Washington warns it will not be consulted

Two messages, separated by hours and a world of intent, landed in the same 24-hour window on 23 June 2026. In Muscat, Iranian and Omani delegations announced a joint working group to negotiate the future administration of navigation, services and costs in the Strait of Hormuz. By the time Western markets opened, Donald Trump was on Fox News warning Tehran that any move to close the chokepoint would draw US military retaliation, and floating a 20% share of any oil that the United States would, in his words, "guard" as a regional "guardian angel."

The juxtaposition is the story. Two regional powers adjacent to the world's most sensitive oil artery are trying to write the rule book for the waterway on their own terms. One external power, which has policed that artery with a carrier strike group for the better part of half a century, is signalling that it intends to be paid for the privilege — or to take the waterway by other means.

What was agreed in Muscat

The Muscat track, announced on 23 June 2026 at 14:29 UTC via outlets tracking the Iranian and Omani foreign ministries, sets up a working group that will negotiate what officials are calling the future administration of navigation in the strait, including services and costs, while reaffirming the right of free passage under international law. Reuters confirmed the talks in a separate dispatch at 13:25 UTC the same day, framing them as a follow-through on a process the two foreign ministers had already opened in the Omani capital.

In substance, that is a claim to a regulatory seat at the world's most important energy chokepoint by two of its littoral states. Iran's coastline hugs the north shore of the strait; Oman controls the south. Together they enclose roughly 21% of global seaborne oil and almost a third of liquefied natural gas shipments. What "administration" means in practice — pilotage, transit fees, safety regimes, the long-running question of which navies may escort which tankers — has never been settled by treaty. The 1982 UN Convention on the Law of the Sea gives both countries overlapping territorial waters and an exclusive economic zone, and stops short of a multilateral strait regime. For four decades, the gap has been filled by a US Navy presence that Tehran and Muscat have tolerated rather than endorsed.

The working group is therefore not a technical committee. It is a small, pointed claim that the waterway belongs to the states on its shores first, and to the outside world second.

The Washington counter-message

Within hours of the Muscat announcement, Trump used a Fox News interview to set out the alternative frame. Asked about Iran's posture in the strait, he said the United States had spoken to the Iranians overnight and warned that any closure would draw overwhelming US force. He added, in the same interview, that the US could become the "guardian angel" of the strait and take 20% of the oil. The two comments travelled together, first reported in summary at 02:58 UTC and expanded at 03:31 UTC on 23 June 2026.

Read literally, the offer is a protection fee: US naval cover in exchange for a one-fifth royalty on every barrel that transits Hormuz. Read structurally, it is a re-assertion of an older order — one in which the United States sets the rules of the waterway, bills the rest of the world for transit, and treats the two adjacent states as objects of policy rather than co-administrators. The "guardian angel" framing collapses the distinction between policing a common sea lane and taxing it; it treats a chokepoint that dozens of importing economies depend on as if it were a US concession.

The same window saw Polymarket traders pricing a non-trivial probability on an Iranian move to close or partially close the strait — the kind of market signal that, in earlier cycles, has moved insurance and freight rates within hours.

Why the timing matters

The Hormuz file has been quietly re-opening for months. Tehran has grown more comfortable pressing the sovereignty case: detention of commercial tankers, stepped-up IRGC Navy fast-boat activity, and a hardening Iranian line in multilateral fora on transit fees. Muscat, which has long styled itself as the Gulf's quiet middleman, has its own reasons to want a settled regime. The Omani economy is less oil-dependent than its neighbours, but a Hormuz rules-based system that locks in Muscat as a co-administrator — rather than a US client — gives the sultanate strategic weight that it has not held for a generation.

What makes the 23 June exchange consequential is not the existence of either track, but their collision. The Muscat working group is a diplomatic instrument: it moves slowly, sits in committee rooms, and depends on both parties continuing to talk. The Trump offer is a transactional instrument, the kind of deal that can be sketched on a teleprompter and dismantled by the next news cycle. A regional rules-based process of the kind Iran and Oman are now sketching is, by design, the opposite of a single-power protection deal — it dilutes Washington's unilateral claim by giving two adjacent states a recognised seat at the table.

Stakes and forward view

If the Muscat process advances, three things follow. First, the question of Hormuz pilotage, transit notification and fees moves out of the bilateral US-Iran shadow and into a regional forum that includes China, India, Japan and South Korea as principal customers — and that is the result Tehran and Muscat appear to want. Second, an agreed fee structure, however modest, narrows the political space for the US to extract its own unilateral levy. Third, the strait becomes a test case for whether the wider post-2018 "maximum pressure" architecture on Iran can be reshaped from below, by adjacent states, rather than re-negotiated between Washington and Tehran.

The counter-reading is that none of this will hold if US-Iran tensions escalate. A working group is not a treaty; it does not survive an exchange of fire. The 23 June messaging from Washington is, in this sense, a stress test — a reminder that the United States still commands the conventional firepower in the Gulf, and that any regional rule book exists at its sufferance. The honest read is that both tracks are now live, both are real, and the next 60 to 90 days will tell us which one is doing the actual work.

The remaining uncertainty is the piece the sources do not yet settle. The exact mandate of the Iran-Oman working group, the level at which it meets, and whether it will publish draft text or operate behind closed doors are all unspecified. The 20% figure from the US side was offered in a televised interview, not a written proposal. Neither side has yet named a counterpart. What is clear is that the chokepoint now has three voices in the room instead of one, and the loudest of them is no longer in Washington.

This publication frames the Muscat track as a regional rules-based process and the Washington response as a transactional counter-bid, rather than treating the latter as the default frame.

Wire provenance

This editorial synthesis draws on the following public wire/social posts:

• https://t.me/wfwitness