Why has Trump threatened to bomb Oman, amid Iran war escalation?

The Lead

United States President Donald Trump has threatened longtime ally Oman with military force if it gets involved in the dispute over shipping access to the Strait of Hormuz, as Washington's war on Iran once again risks engulfing the Middle East. Trump's threat to "blow up" Oman came as Muscat reportedly held talks with Iran about overseeing passage through the strategic waterway that handles more than 20 percent of the world's global oil traffic.

Trump's Unprecedented Threat Against a Key Ally

"Nobody is going to control it," Trump said of the strait during a cabinet meeting in Washington. "It's international waters, and Oman will behave just like everybody else, or we will have to blow them up." This direct threat against a country with which Washington has had relations for more than 200 years has sent shockwaves across the region and drawn international criticism.

While Hormuz is an international strait, most of it is located solely in Iranian and Omani territorial waters – not international waters – with parts of its outlying areas reaching United Arab Emirates (UAE) territorial waters. This geographical reality complicates Trump's assertion that the waterway is purely international.

The Strategic Importance of the Strait of Hormuz

As the only route for Gulf oil producers to ship exports to the open ocean, the strait has served as a free international maritime route for decades. Following the US-Israeli joint attacks on Iran on February 28, however, Tehran closed the waterway and began to assert sovereignty over it, including charging tolls of as much as $2m per ship at times.

Under international maritime law, countries are not permitted to charge tolls to shipping passing through natural straits such as Hormuz, even where they are not in international waters. Countries can, however, provide services to shippers, such as insurance, maintenance and docking assistance.

Regional Implications of Trump's Threat

Shortly before Trump's comment, Iran's state television reported that Iran and the United States were close to agreeing on a memorandum of understanding (MOU) under which Tehran and Muscat would jointly control the strait. The proposal designates payments for passing vessels, framed as "fees for services" rather than "tolls."

While the Trump administration has called the claims of such an MoU "a complete fabrication," analysts say his threat suggests that an understanding between Iran and Oman is precisely what the US president is trying to avoid.

"What Washington wants to prevent is the normalisation of Iranian control over Hormuz, dressed in administrative and legal clothing and given Arab cover by a US ally," Muhanad Seloom, non-resident senior fellow at the Middle East Council on Global Affairs, told Al Jazeera.

International Reaction and Legal Concerns

Critics called the threat reckless. Raed Jarrar, the advocacy director at the US-based rights group DAWN, likened the US president's comments to those of a "mafia boss."

"The UN Charter prohibits the threat of force against any state, and that prohibition binds the United States exactly as it binds everyone else," Jarrar told Al Jazeera. "Threatening to 'blow up' an Arab country because its waters happen to sit along an oil route Washington wants reopened is the same lawless logic that produced this war in February."

Samir Puri, a visiting lecturer in war studies at King's College in London, said Trump's threat to Oman was "really surprising" and warned that it would "send shockwaves across the region."

Oman's Diplomatic Role in the US-Iran Conflict

Oman has played a unique role in the region as a mediator between the US and Iran. Omani Foreign Minister Badr Albusaidi was a key mediator in US-Iran nuclear talks before the war on Iran began. Just before the US-Israeli joint attack on Tehran in February, Albusaidi had been meeting US officials, including Vice President JD Vance, to facilitate negotiations about the future of Tehran's nuclear programme.

Unlike other US allies in the Gulf, such as Qatar, Bahrain and the UAE, Oman does not host US forces. It was nevertheless dragged into the conflict when Iran launched attacks on US military assets and energy infrastructure across the Gulf region in the early days of the war.

Future Outlook for the Region

Seloom, from the Middle East Council on Global Affairs, said Oman is "one Gulf state that is simultaneously a US security partner and Iran's most trusted Arab interlocutor."

"In peacetime, that ambiguity is an asset. In wartime, it becomes a liability, which is precisely the inversion now playing out," he told Al Jazeera.

The analyst argued that joint Iran-Oman control over Hormuz was "more posture than probability." "Oman's real interest is not co-owning Iran's blockade; it is brokering the strait's reopening," he said.

Still, according to Seloom, the prospect of Iran and Oman jointly shaping the future of the Strait of Hormuz alarms the US president for three reasons: "It would turn Iran's grip on the chokepoint into a permanent post-war fact rather than a temporary act of war; it would set a precedent that littoral states can metre and monetise an international waterway, eroding the freedom-of-navigation principle the United States underwrites worldwide; and it would hand Tehran a strategic win that outlasts any ceasefire."