The Hormuz Gambit: Why France and the UK Are Building a Coalition Without Washington

On April 13, 2026, French President Emmanuel Macron and British Prime Minister Keir Starmer announced they would co-chair a conference of roughly 40 nations to plan what Macron called a "purely defensive, purely support" multinational mission aimed at restoring freedom of navigation in the Strait of Hormuz [1][2]. The conference, held by video link on April 17, brought together "non-belligerent countries willing to contribute" to reopening the world's most important oil chokepoint — one that has been effectively shut since late February [3][4].

The initiative marks a rare moment of Franco-British strategic convergence, and an equally rare moment of explicit divergence from Washington. The United States, which imposed its own naval blockade on Iranian ports days earlier, was not a participant. President Trump said reopening the strait was not America's responsibility [5]. Starmer was blunt in response: "We are not supporting the blockade" [6].

The result is a geopolitical split screen: the U.S. enforcing a blockade from the south while European allies organize a parallel effort to restore the commercial transit that blockade and Iranian closure have jointly destroyed.

The Chokepoint That Feeds the World

Before the crisis, the Strait of Hormuz carried roughly 20.9 million barrels of oil per day in the first half of 2025 — about 20-25% of all seaborne oil trade [7][8]. That figure had risen steadily from 17.3 million barrels per day in 2018, driven partly by post-2022 energy realignment after Russia's invasion of Ukraine pushed buyers toward Gulf suppliers [7]. Approximately 20% of global liquefied natural gas (LNG) also transited the strait [9].

Source: EIA / IEA

Data as of Apr 15, 2026CSV

By April 2026, that flow had collapsed. Tanker traffic dropped roughly 90% below pre-conflict levels, with only a handful of AIS-transmitting vessels transiting on any given day [10][11]. Over 150 ships anchored outside the strait to avoid the risk zone [10]. WTI crude oil, which traded near $61 per barrel in January 2026, surged past $114 by mid-April — an 87% year-over-year increase [12].

Source: FRED / EIA

Data as of Apr 6, 2026CSV

The Dallas Federal Reserve modeled three closure-duration scenarios: a one-quarter closure would push WTI to $98; two quarters to $115; three quarters to $132 per barrel. The GDP impact ranges from a 0.2 percentage-point drag on annualized growth for a brief closure to a 1.3 percentage-point hit if the strait stays shut through year-end [13].

Source: Dallas Fed Research

Data as of Apr 15, 2026CSV

How It Got Here

The crisis traces back to the US-Israeli air campaign against Iran that began on February 28, 2026, following the killing of Supreme Leader Ali Khamenei [10]. Iran's Islamic Revolutionary Guard Corps responded by declaring the strait closed, issuing warnings to all shipping, launching at least 21 confirmed attacks on merchant vessels, and laying sea mines in the waterway [10][14].

This was not the first time Iran had threatened the strait. During the Iran-Iraq War in the 1980s, Iran mined the Persian Gulf and harassed tankers with armed speedboats, prompting the U.S. to launch Operation Earnest Will — the largest naval convoy operation since World War II — and Operation Praying Mantis, which destroyed much of Iran's surface navy [15][16]. In 2011-12, President Ahmadinejad threatened closure over nuclear sanctions but did not act. In 2018, President Rouhani made similar threats after Trump withdrew from the nuclear deal [15].

What distinguishes 2026 is that Iran has, for the first time, followed through. Previous threats served as negotiating leverage; the current closure is a wartime defensive measure by a regime that perceives an existential threat [15]. The IRGC retains substantial residual capability even after the air campaign: large numbers of small boats, antiship cruise and ballistic missiles, coastal artillery, and attack drones — many of which can launch from over 1,000 miles inland, with potential Russian resupply [17].

Why Paris and London, Not Brussels or Norfolk

The decision by France and the UK to co-host — rather than the EU, NATO, or the Gulf Cooperation Council — reflects both institutional limitations and specific national capabilities.

NATO as an institution is constrained by Article 5 politics and by the fact that the United States, which provides the alliance's command structure, is pursuing a separate and conflicting strategy in the strait [5]. The EU lacks a standing naval command structure capable of rapid deployment, though France has contributed two frigates to the EU's Operation Aspides [18]. The GCC includes states directly affected by the crisis — Bahrain and the UAE signed the March 19 joint statement — but lacks the naval assets for independent action [19].

France and Britain bring specific assets. France operates Camp de la Paix in Abu Dhabi, a permanent base with nearly 700 personnel that supports naval, air, and ground forces across the Gulf and Indian Ocean [20]. French Lafayette-class frigates and minesweepers are periodically based there. In March, France pledged 10 additional warships to the Middle East for escort operations [18].

The UK maintains the Naval Support Facility in Bahrain, established in 1935 and reopened as a permanent facility in 2018 [21]. However, the Royal Navy's presence in the region has thinned significantly: the minehunters HMS Bangor and HMS Middleton were withdrawn in 2025 and 2026 respectively, leaving the base without ships to command [22]. This makes the UK's co-hosting role more diplomatic than operational — Starmer's government contributes political convening power and intelligence relationships rather than hulls in the water.

Both nations are members of the Combined Maritime Forces (CMF), the 33-nation coalition headquartered at the U.S. Navy base in Bahrain that operates Combined Task Forces 150 (maritime security), 151 (counter-piracy), and 152 (Gulf security cooperation) [23]. CTF-150's area of operations already includes the Strait of Hormuz and spans over two million square miles [23]. The proposed new mission would operate outside this U.S.-led command structure — a deliberate choice that signals European willingness to act independently when Washington's priorities diverge from their own.

The March 19 Coalition and the April 17 Conference

The diplomatic groundwork was laid on March 19, when the UK, France, Germany, Italy, the Netherlands, and Japan issued a joint statement condemning Iran's attacks on commercial vessels and calling for the strait's reopening [19]. The statement invoked the UN Convention on the Law of the Sea and UN Security Council Resolution 2817, and was eventually co-signed by 38 countries including Canada, South Korea, Australia, Bahrain, the UAE, Norway, and Nigeria [19].

The April 17 conference expanded this coalition to approximately 40 nations. The talks were structured around four working groups: freedom of navigation and maritime security; possible economic sanctions on Iran if the strait remains closed; securing the release of stranded seafarers and vessels; and working with the shipping industry to prepare for resumed transit [4][24].

The mission's stated character is "purely defensive" — no combat operations. Planners envision mine clearance as the first priority, using autonomous minehunting systems and Remus reconnaissance drones already positioned in the region [11]. Convoy escorts would follow, with a potential force including Royal Navy Type 45 destroyers, French frigates, and — despite the political distance — U.S. Arleigh Burke-class guided-missile destroyers coordinated through separate channels [11][17].

The conference did not produce a binding agreement. No formal memorandum of understanding or standing naval task force was announced. The deliverable structure remains closer to a coordination framework than a treaty — diplomatic alignment on principles and working-group mandates, with operational details to follow "when security conditions allow" [3][4].

Who Is Most Exposed

The economic pain of a closed strait falls disproportionately on Asia. Japan sources roughly 75% of its oil imports through the Strait of Hormuz; South Korea and India each depend on it for about 60% [25][26]. China, the world's largest buyer of Iranian crude, routes approximately 40% of its oil imports through the waterway [25].

Source: Zero Carbon Analytics / CNBC

Data as of Apr 15, 2026CSV

LNG exposure compounds the problem. Qatar and the UAE account for 99% of Pakistan's LNG imports, 72% of Bangladesh's, and 53% of India's [25]. South Korea and Japan hold LNG reserves sufficient for only two to four weeks of stable demand [25]. Japan's oil strategic reserves are more substantial — roughly eight months' supply — but South Korea's net oil imports represent 2.7% of GDP, making it among the most vulnerable on the current account front, according to Nomura [26].

Japan imports 1.6 million barrels per day through the strait; a sustained closure would widen its trade deficit, weaken the yen, and risk stagflation [26]. The Dallas Fed estimates that 80% of oil transiting Hormuz is shipped to Asia, concentrating the supply shock in economies that have few alternative sources at scale [13].

Several of these exposed countries — Japan, South Korea, and Australia — signed the March 19 joint statement and were invited to the April 17 conference [19]. India and China were not among the signatories. India's absence is notable given its exposure; China's is unsurprising given its diplomatic approach to the crisis.

The Case That a Coalition Makes Things Worse

Beijing's objection to Western-led naval coordination in the strait deserves serious consideration. China's position, articulated by Defense Minister Dong Jun, is that the strait "is open to us" — meaning China has secured bilateral passage arrangements with Tehran [27][28]. Chinese Foreign Ministry spokesperson Mao Ning called the U.S. blockade "dangerous and irresponsible" and urged all parties to "focus on the general direction of dialogue and peace talks" [29].

China's strategic logic is straightforward: sending more foreign warships into the strait increases the risk of military clashes and turns the region into a flashpoint, expanding the conflict rather than containing it [30]. Beijing prefers bilateral diplomacy with Tehran — a channel that has reportedly allowed at least four Iran-linked tankers to transit the strait even after the U.S. blockade was declared [27].

This is not merely a Chinese position. Turkey has advocated for negotiations and the strait's immediate opening. Spain's defense minister called the blockade "senseless" [6]. The concern that a formal multinational naval presence could be perceived by Iran as a hostile act — provoking exactly the kind of incident it is meant to prevent — has historical precedent. The 1988 downing of Iran Air Flight 655 by the USS Vincennes, which killed 290 civilians during heightened naval operations in the Gulf, remains a case study in how dense military deployments in confined waters produce catastrophic miscalculations [15].

The Washington Institute for Near East Policy has noted that a task force comparable to the 1987-88 Operation Earnest Will would require roughly 30 warships — nearly a third of the current U.S. fleet of around 100 major surface combatants [17]. Sustaining such a commitment is questionable, and the force itself creates a target-rich environment for Iran's remaining asymmetric capabilities.

What Combined Task Forces Actually Achieve

The proposed mission's predecessors offer mixed evidence. Combined Task Forces 150, 151, and 152 have operated in and around the Gulf for over two decades under U.S.-led command [23]. CTF-151, established in 2009 to counter Somali piracy, is widely credited with reducing piracy incidents in the Gulf of Aden. CTF-152, focused on Gulf security cooperation, has facilitated information sharing and confidence-building among GCC navies [23].

But these task forces operate in permissive environments against non-state threats. None has faced a scenario where a major regional power has actively mined a strait, attacked merchant shipping, and deployed cruise missiles against naval assets. The mine threat alone is a capability gap: the U.S. Navy currently has only one littoral combat ship with a mine countermeasures mission package deployed to the region [17]. The UK's dedicated minehunters have been withdrawn [22]. France's mine warfare capabilities, while more robust, have not been tested against the scale of mining Iran has reportedly conducted.

A formal security architecture would add coordination protocols, rules of engagement, burden-sharing agreements, and political legitimacy that bilateral or ad hoc patrols cannot provide. It would also create a standing framework for intelligence sharing on mine locations, IRGC fast-boat movements, and missile threats. Whether these procedural advantages outweigh the escalation risks of a visible multinational naval presence depends on assumptions about Iranian decision-making that neither side can verify.

What Comes Next

The April 17 conference was a beginning, not a conclusion. The talks produced working-group mandates but no operational timeline, no force commitment schedule, and no formal agreement. Macron's formulation — that the mission would launch "as soon as possible after the most intense phase of the conflict has ended" — leaves the timeline contingent on a ceasefire whose terms remain unresolved [3][18].

European naval forces are being staged at two assembly points: near Cyprus in the eastern Mediterranean and in the southwestern Indian Ocean [18]. Mine clearance would need to precede any escort operations, and the scope of Iran's minefields in the strait remains only partially mapped [17].

The coalition faces a structural tension: it needs enough military capability to credibly secure the strait, but not so much that it triggers the escalation spiral China and others warn about. It seeks independence from U.S. command, but may need U.S. Arleigh Burke destroyers and intelligence assets to function. And it promises a "purely defensive" posture in a theater where the line between defense and offense — between clearing a mine and striking the unit that laid it — is operationally thin.

For the 40 nations at the table, the calculation is ultimately about whether a rules-based maritime order in the world's most important energy chokepoint can be restored through collective action, or whether the strait's future will be determined by the bilateral deals of great powers with the leverage to cut them. The answer will shape energy security, alliance structures, and the meaning of freedom of navigation for years to come.