IRGC claims sole authority over Strait of Hormuz shipping routes in midnight notice

A midnight bulletin from the Islamic Revolutionary Guard Corps, relayed by the Iranian state and state-adjacent outlets Fars, Tasnim, Press TV, Mehr and Al-Alam Arabic in the small hours of 25 June, declared that the IRGC Navy holds sole authority over shipping routes through the Strait of Hormuz. The notice, in Fars's framing, described the waters south of the strait as "illegal and unsafe," and warned that vessels intending to transit them would be dealt with by IRGC forces. Published as a notional "Sadasima", a Persian-language form of public communique, the text is less a legal claim than a ritual one: a restatement of jurisdiction over a chokepoint that carries a fifth of global oil flows. The bulletin landed in the same news cycle as a fresh round of US strikes on Iranian military infrastructure, and a CENTCOM assertion that Iran had broken a ceasefire by hitting the motor tanker M/T Kiku near the strait earlier the same morning. The routing claim, in other words, did not appear in a vacuum. It appeared while the strait itself was on fire.

The escalation is now in its second military cycle. CENTCOM, headquartered in Tampa, announced late on 27 June (the Telegram timestamps in our record) that its forces had "conducted additional strikes against multiple targets in Iran" at the Commander in Chief's direction, after "yesterday's US strikes" had failed to end Iranian action against commercial shipping. The targets named by CENTCOM, as relayed by Clash Report and The Cradle, were surveillance, communications, air defence, drone storage and minelaying sites, the standard architecture of a layered anti-access posture around the strait. Iran International–adjacent and Farsi-language accounts of the operation referenced strikes near Sirik, on Qeshm and around Tahrouyi village, where Iranian state TV reported multiple explosions and where a telecommunications tower was visibly hit. OSINT technical analysts noted that at least four KC-135 Stratotankers and three KC-46A Pegasus tankers were active in the airspace over the strait at the time of the strike package, the aerial refuelling signature of a medium-weight combat air patrol.

The IRGC's own statement, distributed across Mehr, Press TV, Al-Alam Arabic and Tasnim's English feed, asserted that the force's naval units had fired "warning shots" at offending vessels in the strait, and that the detonations heard in Sirik and on Qeshm were IRGC actions against "American aggressors." A follow-up communique promised that "the details of tonight's operation of the IRGC Navy fighters against the American aggressors will be officially published in an hour." The framing is deliberately archaic, a Sadasima is a textual form associated with imperial-era decrees, and the choice signals that the IRGC is presenting its claim over the waterway in a register of sovereignty rather than in the procedural language of the International Maritime Organization.

The waters in question

The Strait of Hormuz is the narrowest point on the oil-export route from the Persian Gulf to the Arabian Sea, and its geography is the politics. At its tightest it is roughly 33 kilometres wide, split into two-mile inbound and outbound shipping lanes separated by a two-mile buffer. Under the United Nations Convention on the Law of the Sea, transit passage through international straits is a right that may not be suspended, and Iran's own 1993 and 1994 declarations on the strait formally recognise that regime. The IRGC's midnight notice does not try to argue that body of law; it argues past it, in the older vocabulary of coastal command. The claim is not that Iran owns the water, Tehran has spent three decades carefully not saying so, but that the IRGC, as the regime's paramilitary custodian, is the only force that can grant safe passage through it.

This is a posture, not a doctrine. It sits alongside a documented pattern of harassment, fast-boat intercepts, and seizures of commercial tankers that has run since 2019, and it tracks with the Strait of Hormuz's elevation, in Iranian military planning, from a transit corridor to a coercive instrument. A senior US defence official told Fox that Iran has, since the US bombing campaign ended in April, reconstituted its air defence and missile systems along the strait, the same systems the latest CENTCOM strikes are now trying to dismantle a second time.

What the record actually shows

Several threads in the public record are solid, and several are not. Solid: the IRGC published a routing claim to its own state-aligned outlets and a Sadasima-style warning to commercial traffic; CENTCOM announced a new round of strikes and named the target set; OSINT analysts captured the refuelling pattern of the strike package; a US official speaking to Axios confirmed the strikes were a response to the day's attack on a commercial tanker. Less solid: no independent shipping-industry or Western-wire confirmation has surfaced in the Telegram and X record we have of an actual IRGC engagement with US or allied naval units on 25 June. The IRGC's own description of "warning shots" and operations against "American aggressors" sits alongside CENTCOM's claim that it struck minelayers, surveillance and air-defence targets in Iran. Both can be partly true; both are filtered through each side's preferred vocabulary. The truthful sentence is the boring one: there is now a second open cycle of US strikes on Iranian military infrastructure in less than three months, framed by Tehran as a defence of sovereignty and by Washington as self-defence against a ceasefire-breach.

The claim that travels

The reason the IRGC's routing bulletin matters more than its immediate tactical content is that it is a template. The text does not name a rival authority, but it does pre-empt one: if the IRGC writes the rules of passage, then any other naval presence in the strait is, by definition, an uninvited intrusion. The legal and diplomatic work that follows, coastal-state assertions to the IMO, flag-state advisories, tanker-insurance repricing, is downstream of the line drawn in the bulletin. Iran's five-year pattern of incremental claims on the strait is not a claim to ownership but a slow accretion of jurisdiction by communique. Each Sadasima tightens the frame.

The reading the wires did not give us

There is no Western wire story in this record identifying a specific non-IRGC authority that the routing claim is positioned against. The bulletin is addressed to vessels, not to a government. That is the point. By asserting the power to grant or withhold safe passage, the IRGC casts every other maritime force in the strait, the US Fifth Fleet, the Royal Navy, the French Marine nationale, the Combined Maritime Forces' Combined Task Force 153, into the role of interlopers, regardless of their actual presence. The claim does not need a named rival. It works because the geography is the rival, and the geography does not move.

Sources

• [Tasnim News English, IRGC Navy operation notice] (https://t.me/tasnimnews_en/)
• [Tasnim Plus, "The enemy's presence in the Strait of Hormuz and the Persian Gulf"] (https://t.me/tasnimplus/)
• [Fars News International, CENTCOM strikes reported as US aggression] (https://t.me/FarsNewsInt/)
• [Mehr News Agency] (https://t.me/mehrnews/)
• [Press TV] (https://t.me/presstv/)
• [Al-Alam Arabic] (https://t.me/alalamarabic/)
• [The Cradle, CENTCOM statement on additional strikes] (https://t.me/TheCradleMedia/)
• [Clash Report, CENTCOM target set and ceasefire-break framing] (https://t.me/ClashReport/)
• [OSINT Defender via OSINTLive, Trump confirmation, refuelling pattern, Kiku tanker attack] (https://t.me/osintlive/)
• [Witness (wfwitness), telecommunications tower strike in Tahrouyi, Sirik] (https://t.me/wfwitness/)
• [Middle East Eye live coverage] (https://www.middleeasteye.net/live/live-us-and-iran)
• [Intelslava, Axios sourcing of US strikes] (https://t.me/intelslava/)

Desk note: Monexus reads the IRGC bulletin as a jurisdictional claim of passage, not as a stand-alone ownership assertion, and pairs it with the CENTCOM strike record of 27 June to show the cycle it lands inside. Iranian state outlets are used as primary sources for the IRGC's own position; CENTCOM statements and OSINT accounts are used for the US response. No Western wire attribution has been imported for facts not present in the available record.