17JUN

US threatens Oman, its oldest Iran link

4 min read

10:21UTC

Scott Bessent warned Oman on 28 May the US would target any actor facilitating Hormuz tolls, and Muscat backed down within the day, leaving Pakistan as the sole active mediator.

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Key takeaway

Washington threatened the Oman channel it has used to reach Tehran since 1981, leaving Pakistan to broker alone.

US Treasury Secretary Scott Bessent warned Oman on 28 May that Washington would "aggressively target any actors involved, directly or indirectly, in facilitating tolls for the strait".⁠¹ Trump reportedly threatened to "blow them up" after Iranian state media said Tehran and Muscat would jointly manage Strait of Hormuz traffic.⁠² Oman is the Gulf sultanate that brokered the secret Muscat channel behind the 2015 nuclear deal and has carried messages between Washington and Tehran since the 1981 hostage settlement. Muscat brokers; it does not threaten US interests.

Oman backed down within the day, its ambassador assuring Washington there was no toll plan. The threat still landed on the architecture any deal depends on. Tehran has demanded the release of roughly $12bn in Qatar-held frozen assets before any Hormuz sequence, and Rubio had already called the tolls a "deal-killer". Threatening the neutral broker over the same tolls leaves Pakistan, whose foreign minister Ishaq Dar met US Secretary of State Marco Rubio in Washington on 29 May, as the sole active mediator.⁠³

The Muscat channel does not regenerate on demand. Oman's value was precisely its neutrality: it carried messages no formal channel could, and the quiet talks it hosted between 2013 and 2015 enabled a nuclear agreement Western formal diplomacy could not reach directly. A private toll warning may be leverage rather than rupture, and Oman's quick denial proves it worked. The cost is that the maximum-pressure logic now treats a 45-year backchannel as a sanctions target, and Pakistan, a broker with its own regional stakes, inherits a role Oman performed without them.

Deep Analysis

In plain English

Oman is a small Gulf country that has quietly acted as a go-between for the US and Iran since the 1980s. Both sides trust Oman because it talks to everyone and picks no sides publicly. Iranian state media reported on 27-28 May that Iran and Oman might jointly run traffic through the strait of Hormuz, where one-fifth of the world's oil travels. US Treasury Secretary Scott Bessent warned Oman on 28 May that America would punish anyone helping Iran collect tolls on ships passing through the strait. Trump reportedly also threatened to 'blow up' Oman. Oman immediately denied any toll plan. By losing Oman's trust, Washington pushed the role of intermediary onto Pakistan, which has less financial infrastructure to handle the kind of deal that requires a trusted bank channel.

Deep Analysis

Root Causes

Oman's exposure on 28 May was structural rather than diplomatic carelessness. Iranian state media's broadcast of a joint Tehran-Muscat Hormuz management plan forced the sultanate into a publicly visible position it had likely maintained privately since IRNA first reported a draft bilateral transit protocol with Oman in April 2026.

The underlying driver is geographic: Oman's territorial waters cover the southern half of the 33-kilometre strait under UNCLOS, meaning any Iranian toll scheme that routes through Omani waters sits partially outside CENTCOM's enforcement geometry.

Bessent's threat reflects a specific Washington anxiety: that Oman's UNCLOS position could be used to legitimise Iranian toll collection as a joint sovereign act rather than a unilateral Iranian imposition, which would complicate the legal basis for CENTCOM interdictions. The threat was aimed at collapsing that legal architecture before it could be formalized.

What could happen next?

Risk
Pakistan lacks the banking infrastructure and UNCLOS territorial position that made Oman useful for frozen-asset routing; sole-mediator elevation increases Islamabad's exposure to Iranian demands it cannot operationally satisfy.
Consequence
Oman's public denial of the joint-management plan removes the one legal framework that could have grounded Iranian toll collection in a bilateral sovereign act rather than a unilateral Iranian imposition.

Source Landscape

This story draws on mixed-leaning sources from Qatar and United States

Qatar

United States

Primary parallel: In June 1987, Washington threatened Kuwait with a cutoff of US naval escort under Operation Earnest Will if Kuwait allowed Iranian speedboats to use Kuwaiti waters as staging grounds. Kuwait complied within 72 hours and publicly denied any accommodation with Iran. The structural mechanism matched 28 May exactly: a threat against a neutral Gulf state that was perceived as facilitating Iranian Strait operations, producing rapid public denial with unknown private continuation.

Counter-parallel: In 2013 Oman hosted the secret Muscat channel for US-Iran nuclear talks without any US threat against Muscat, because the Obama administration judged that publicising or pressuring the channel would collapse it. The 2026 Bessent threat is the inverse of that approach, and Oman's value as a channel depends on Iran believing Muscat can say no to Washington without being sanctioned.

Oman's economy depends on roughly $15 to $20 billion in annual transit revenues and port fees from Hormuz-adjacent trade through the Port of Sohar and the Port of Salalah.

A US sanctions action against Omani entities involved in Hormuz toll facilitation would expose those ports to secondary-sanctions risk for any shipping company using US-dollar settlement, which covers the large majority of container trade. The threat therefore carried disproportionate economic weight relative to the specific toll-management proposal, explaining the 24-hour capitulation.

Pakistan's elevation as sole active mediator after Oman's forced withdrawal adds an indirect cost: Islamabad lacks the financial infrastructure and legal neutrality that made Oman's banking channels useful for frozen-asset negotiations. Any future transaction involving the $12 billion in Qatar-held Iranian assets will require a different routing architecture.

Consensus view: RUSI's Neil Quilliam and the International Crisis Group's Gulf programme assess the Oman threat as a structural miscalculation: Oman's value to Washington is precisely its non-aligned posture, and threatening a sanctions action against the sultanate degrades the one channel Tehran trusts enough to use for backchannel communication.

Losing Oman as a credible intermediary compresses the diplomatic geometry at exactly the moment a signed MOU requires a trusted third-party custodian.

Counter-view: The Gulf Research Center in Dubai and former Pakistani diplomat Riaz Khokhar argue the one-day turnaround (threat on 28 May, Omani denial by end of day) proves the coercive signal worked exactly as intended: Muscat had already stepped too close to the Iranian toll-management architecture, and a private sanctions warning is the lowest-cost way to pull an ally back without a public confrontation.

Key tension: Whether the speed of Oman's capitulation reflects a healthy coercive signal or whether Muscat simply learned not to announce co-management of Hormuz publicly while privately continuing to facilitate, rendering the threat a cosmetic rather than structural correction.

First Reported In

Update #112 · Treasury opens a second Iran sanctions front

Al Jazeera· 30 May 2026

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Causes and effects

Caused by

Rubio names Hormuz tolls a deal-killer

Rubio's prior designation of Hormuz tolls as a deal-killer set the political predicate for Bessent's direct sanctions threat against Oman over the same tolls.

Occurred 21 May 2026

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Iran demands $12bn freed before Hormuz

Iran's $12 billion Qatar-assets precondition for Hormuz reopening made Oman's reported role as joint Hormuz manager politically toxic, triggering Bessent's threat.

Occurred 24 May 2026

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This Event

US threatens Oman, its oldest Iran link

Threatening the neutral broker over tolls spends a 45-year backchannel and narrows the war to a single, less impartial mediating channel.

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