Iran has moved to reassert control over the Strait of Hormuz as nuclear and sanctions negotiations with the United States remain unresolved, with Iranian officials signalling their capability and willingness to restrict passage through the waterway if pressure on Tehran continues. The Strait of Hormuz is the single most important maritime chokepoint in global energy markets — roughly a fifth of the world’s oil supply transits through it — making Iran’s posture there an instrument of economic leverage far beyond the Gulf region. The development comes after the Trump administration’s “final determination” meeting on Iran produced no announced deal, leaving the diplomatic situation in an unresolved limbo that Tehran appears determined to exploit.
The received wisdom
The broadly accepted framework for understanding Iran’s Hormuz signalling is one of defensive deterrence: a sanctioned, economically strained state using geography as leverage to avoid military confrontation it cannot win conventionally. The mainstream view, shared across much of the Western foreign policy establishment, is that the appropriate response is patient diplomacy combined with economic pressure — that tightening the sanctions noose will eventually bring Tehran to a comprehensive agreement on its nuclear programme, and that Hormuz saber-rattling is a negotiating tactic rather than a genuine strategic shift. There is a real-world basis for this reading: Iran has threatened Hormuz before — most notably during the Obama-era nuclear negotiations — and the threat was ultimately subordinated to a deal. The 2015 JCPOA demonstrated that Iranian leadership, under sufficient pressure, will accept constraints on its nuclear programme in exchange for sanctions relief.
A different read
The problem with applying the JCPOA template to the current situation is that the structural conditions have changed in ways that make a comparable deal harder to reach — and Iran’s Hormuz posture correspondingly harder to dismiss.
Al Jazeera reports that Iran is explicitly linking its Hormuz stance to the absence of progress in talks, treating maritime leverage not as a long-term threat but as a near-term negotiating chip. This is different from previous episodes. In 2012 and 2019, Hormuz threats were responses to specific sanctions escalations. The current posture is more proactive — Tehran is positioning itself before a deal has collapsed, not after. That suggests a strategic calculation that the leverage is worth deploying early, perhaps because Iranian leadership has concluded that a comprehensive deal is unlikely regardless of its negotiating stance.
The reasons for that pessimism are not hard to find. BBC News notes that Trump’s “final determination” meeting produced no announced agreement, leaving the diplomatic calendar open-ended. Within the current US administration, the Iran hawks — including Pete Hegseth, who told the Shangri-La Dialogue that Washington is “more than capable” of resuming war against Iran — are a powerful constituency against any deal that critics can characterise as appeasement. The political space for a JCPOA-style grand bargain is narrow, and both sides know it.
What follows from this analysis is uncomfortable for those who prefer diplomatic optimism: if neither party expects a comprehensive deal, then Iran’s Hormuz leverage becomes something more than a negotiating tactic — it becomes a long-term strategic posture. And long-term strategic postures in chokepoints tend to produce incidents, either by design or by miscalculation. The historical record of contested straits — the Dardanelles in 1915, the Taiwan Strait in 1958 and 1995, the Gulf of Oman in 2019 — is a record of brinkmanship that periodically crosses into shooting. Each of those episodes was preceded by precisely the kind of graduated signalling Iran is currently conducting.
The energy market implication is equally under-examined. A prolonged Iranian Hormuz squeeze — even a partial one, through harassment of tankers rather than outright closure — would hit Asian importers hardest. Japan, South Korea, India, and China source enormous proportions of their oil through the strait. Beijing’s quiet leverage in restraining Tehran is real but has its limits: China benefits from cheap Iranian oil under sanctions but also needs stable global energy markets. The triangular relationship between Washington, Tehran, and Beijing over Hormuz is more complicated than the bilateral framing of US-Iran negotiations suggests.
What to watch
- Whether the Trump administration’s next move on Iran is military, diplomatic, or a further tightening of sanctions — the choice will determine whether Hormuz tensions escalate or de-escalate over summer.
- Global oil price movements as a real-time indicator of market confidence in Hormuz stability: a sustained move above recent ranges would signal that traders are pricing in a meaningful risk of disruption.
- Chinese diplomatic engagement with Tehran — Beijing has both the most to lose from a Hormuz closure and the most leverage over Iranian decision-making.
- Any hardening of Iranian naval activity in the Gulf, particularly around tanker transit lanes, which would indicate that posturing is transitioning to physical interdiction.
— J