Iran Threatens Bab-el-Mandeb Strait as Second Global Chokepoint Amid Hormuz Standoff

On a Sunday in early April, Ali Akbar Velayati — former Iranian foreign minister and senior adviser to the late Supreme Leader Ali Khamenei — posted a warning on X that redrew the map of global energy risk. "The unified command of the Resistance front views Bab al-Mandeb as it does Hormuz," he wrote. "If the White House dares to repeat its foolish mistakes, it will soon realize that the flow of global energy and trade can be disrupted with a single move." [1]

The statement was not hypothetical. Since February 28, 2026, when U.S. and Israeli forces launched airstrikes on Iran that killed Khamenei and struck military and nuclear facilities, the Strait of Hormuz has been functionally closed to unauthorized traffic [2]. Iran's Islamic Revolutionary Guard Corps (IRGC) has launched at least 21 confirmed attacks on merchant ships and reportedly laid sea mines in the strait [3]. Now Tehran is signaling that the 29-kilometer-wide Bab-el-Mandeb strait — the southern gate to the Red Sea, controlled on one shore by Iran-backed Houthi forces — could become the second front in what analysts are calling a "double chokepoint" crisis [4].

The Arithmetic of Two Straits

The scale of what is at stake can be measured in barrels per day. Before the current crisis, the Strait of Hormuz carried approximately 20.5 million barrels per day (bpd) of crude oil and petroleum products — roughly 20% of global supply [5]. The Bab-el-Mandeb, though smaller, handled about 4.8 million bpd and served as the transit point for approximately 12% of global trade by value, with some 19,000 vessels per year passing through [6].

Source: EIA World Oil Transit Chokepoints

Data as of Dec 1, 2025CSV

Combined, the two straits account for over 25 million bpd of oil transit — a quarter of global energy flows. The Dallas Federal Reserve has estimated that the Hormuz closure alone could push West Texas Intermediate crude to $98 per barrel and shave 2.9 percentage points off global GDP growth [7]. Some Wall Street analysts have warned of prices reaching $200 if both chokepoints are simultaneously disrupted [8]. The World Economic Forum has flagged cascading effects beyond oil: aluminum, fertilizer, helium, and LNG markets all face supply disruptions [9].

LNG traffic through Bab-el-Mandeb had already dropped to near-zero levels by mid-2024 during the Houthi Red Sea campaign, as carriers diverted around the Cape of Good Hope [6]. Container shipping, which constitutes the remaining 60% of Suez Canal traffic, would face similar rerouting — adding 10 to 14 days and substantial fuel costs to Asia-Europe voyages.

How Iran Projects Power 2,000 Miles from Home

Iran does not need its own navy at the Bab-el-Mandeb. It has the Houthis.

The Ansar Allah movement, commonly known as the Houthis, controls large sections of Yemen's Red Sea coastline and sits directly astride the strait's narrowest point. Between late 2023 and mid-2025, the group demonstrated its capability by striking dozens of commercial vessels with drones, anti-ship ballistic missiles, and explosive boats — forcing major shipping companies including Maersk and MSC to divert traffic away from the Red Sea entirely [10].

The International Institute for Strategic Studies (IISS) has characterized the Iran-Houthi relationship as a "partnership" rather than a direct command structure: Iran provides technical assistance, missile components, and intelligence, while the Houthis retain operational autonomy [11]. Gregory Brew, a historian of Iranian oil and senior analyst at the Eurasia Group, assessed the threat plainly: "The Houthis' threat here is a real one." [11]

The operational mechanism is asymmetric warfare. The Houthis do not need to physically blockade the strait with warships. Their arsenal of Iranian-supplied anti-ship cruise missiles, one-way attack drones, and the demonstrated willingness to use them creates what military planners call an "area denial" capability — making transit so risky and expensive that commercial shipping voluntarily avoids it. The effect of a blockade without a traditional blockade.

On March 14, 2026, senior Houthi officials announced formal military alignment with Iran in the broader conflict, declaring what they called "Hour Zero" and identifying closure of Bab-el-Mandeb as a "primary option" [12]. A U.S. Maritime Administration advisory issued shortly after warned that although the Houthis had not attacked commercial ships since the Israel-Gaza ceasefire in October 2025, they "continue to pose a threat to U.S. assets, including commercial vessels, in this region" [13].

Asia's Uneven Exposure

The dual-chokepoint threat falls hardest on Asia. China, India, Japan, and South Korea collectively accounted for 69% of all crude oil and condensate transiting Hormuz in 2024 [14]. But their vulnerability varies sharply.

Source: Gulf International Forum / EIA

Data as of Jun 1, 2025CSV

Japan and South Korea face the most acute exposure: between 60% and 75% of their crude imports transit the Strait of Hormuz [14]. Taiwan, at roughly 65%, is similarly dependent. India, at 42%, and China, at 38%, have somewhat more diversified supply chains — China in particular has invested heavily in overland pipelines from Central Asia and Russia — but the volumes at risk remain enormous in absolute terms [15].

The critical variable is reserves. Japan maintains strategic petroleum stockpiles sufficient for 254 days of domestic supply; South Korea holds 210 days [16]. These buffers, built over decades of IEA-mandated reserves policy, provide substantial runway. China's reserves cover an estimated 115 days — three to four months of imports [16]. India, at roughly 60 days, is the most exposed major Asian economy.

Source: Fortune / IEA

Data as of Mar 1, 2026CSV

By early March, Asian governments had already begun drawing down stockpiles and restricting exports. Fortune reported that China, Japan, South Korea, and Thailand all took emergency measures as the Hormuz closure entered its second week [16].

The Escalation Timeline: External Pressure and Iranian Response

The realist case for Iran's behavior starts with the events of February 28. According to the U.K. House of Commons Library and multiple news organizations, the U.S.-Israeli strike campaign was launched during active diplomatic negotiations between Washington and Tehran [2][17]. Iranian foreign minister Abbas Araghchi had stated just three days earlier that a "historic" agreement was "within reach" [3].

Iran's response followed what international security scholar Robert A. Pape, writing in Foreign Affairs, described as a pattern of "horizontal escalation" — widening the conflict into political and economic domains to raise costs for the United States and Israel beyond what military operations alone could inflict [3]. Iran launched hundreds of drones and ballistic missiles at Israel and, for the first time, struck all six Gulf Cooperation Council countries — Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the UAE — where U.S. forces are based [3].

The Hormuz closure was the sharpest instrument. As one analyst quoted by CNN observed: "What this war has done is handed Iran a weapon that is far more usable than nuclear weapons, which is the Strait of Hormuz choking off global supplies." [18] Reports emerged that Iran was charging approximately $2 million per vessel for safe transit — potentially generating hundreds of millions of dollars in hard currency at a time when its military and civilian infrastructure had suffered extensive damage [18].

The Bab-el-Mandeb threat, in this framing, is a logical extension of the same strategy: broadening the economic pressure to the point where continued military operations become costlier for Washington than a negotiated settlement.

A History of Threats — and Their Market Effects

Iran has threatened the Strait of Hormuz repeatedly since 1979, with major episodes in 1988 (Operation Praying Mantis), the 2011–2012 sanctions standoff, and the 2019 tanker seizures [5][19]. In previous cycles, the pattern was consistent: threats produced short-term oil price spikes and insurance premium surges, but physical disruption was limited and markets treated the rhetoric as largely performative.

The 2026 crisis broke that pattern. Brent crude jumped 10–13% in early trading after the Hormuz closure [8]. The Dallas Fed described the disruption as "the largest to world energy supply since the 1970s energy crisis" [7]. The difference, analysts note, is that Iran followed through: the IRGC's mine-laying, ship attacks, and transit-fee demands converted what had historically been coercive signaling into an actual operational blockade.

The Insurance Architecture: Modern Markets vs. the Tanker War

The financial mechanics of maritime disruption have changed fundamentally since the 1980s Tanker War, when 546 commercial vessels were attacked over three years without halting oil flows [20]. During that conflict, Iran actually lowered oil prices to offset higher insurance costs, and global prices declined steadily [20].

Source: Kpler / Lloyd's List

Data as of Apr 1, 2026CSV

Today's insurance architecture is, in the language of systems theory, far more tightly coupled. War-risk premiums for Red Sea and Gulf transit surged from roughly 0.07% of hull value before the Houthi campaign to approximately 0.7% at the peak of Red Sea attacks in mid-2024 [21]. After a ceasefire-driven lull in 2025, premiums spiked again to 1% of hull value following the Hormuz crisis — meaning a $100 million vessel now pays approximately $1 million per voyage in war-risk costs alone [22]. Under a dual-chokepoint scenario, underwriters have indicated premiums could reach 1.5% or higher [21].

The structural change is that modern P&I clubs (Protection and Indemnity — the mutual insurance associations that cover third-party shipping risks) exclude war zones from standard coverage [23]. When the Joint War Committee designates an area as high-risk, owners must purchase separate war-risk policies or accept uncovered exposure. Reinsurers forced P&I clubs to exclude Red Sea coverage entirely during the 2024 Houthi campaign, restoring it only at significantly higher premiums [23]. A dual-chokepoint designation would likely trigger a similar or more severe market response.

The threshold comparison to the Tanker War is instructive. In the 1980s, the insurance market was less concentrated and less dependent on reinsurance chains. Today, a relatively small number of reinsurers backstop the global marine market, meaning a coordinated withdrawal of coverage from both the Persian Gulf and Red Sea corridors could produce cascading coverage gaps that the 1980s architecture was distributed enough to absorb [20].

Coalition Options and Legal Constraints

The U.S. Fifth Fleet, headquartered in Bahrain, anchors the Combined Maritime Forces — a multinational coalition whose Combined Task Force 153 is specifically responsible for Red Sea and Bab-el-Mandeb security [24]. The European Union's EUNAVFOR Aspides mission provides an additional layer of escort capability [25].

Under the United Nations Convention on the Law of the Sea (UNCLOS), the Bab-el-Mandeb qualifies as an international strait subject to transit passage rights — meaning no coastal state can legally suspend navigation [26]. The United States has consistently maintained that unilateral closure of transit straits violates international maritime law [13].

The operational challenge is enforcement without escalation. The Houthis' asymmetric arsenal — low-cost drones and missiles fired from concealed mobile launchers along Yemen's coastline — is designed to be difficult to suppress without sustained ground operations or intensive air campaigns. The 2024 U.S.-U.K. strikes against Houthi positions degraded but did not eliminate the group's launch capability [10]. A renewed campaign, particularly while the U.S. military is engaged in the broader Iran conflict, would strain resources and risk widening the war.

MARAD's current advisory instructs U.S.-flagged vessels to maintain a 30-nautical-mile standoff from military vessels and respond to all VHF calls from coalition navies [13]. This is force protection guidance, not a solution to commercial transit risk. The fundamental tension is that coalition navies can escort individual convoys but cannot make the strait commercially safe at the volume required for normal trade flows — not without neutralizing the launch sites, which means deeper involvement in Yemen.

Bluff or Operational Plan?

The skeptic's case is straightforward: Iran's dual-chokepoint rhetoric is a negotiating position, not a war plan. Tehran wants sanctions relief, nuclear concessions, and reconstruction assistance. Threatening global energy flows is the strongest card it holds, and actually playing it — provoking a full U.S. naval response — would be self-defeating.

There is evidence for this view. The April 7–8 ceasefire agreement between Washington and Tehran included provisions for reopening Hormuz, suggesting Iran sees the blockade as a bargaining chip rather than a permanent posture [27]. The failed Islamabad negotiations that collapsed on April 12 reportedly deadlocked on two points: Iran's refusal to reopen Hormuz and its refusal to surrender its stockpile of highly enriched uranium [18]. Both are textbook coercive demands — assets to be traded, not burned.

The counter-argument is that the Houthis' "Hour Zero" declaration and their history of independent action complicate the bluff theory. Even if Tehran views Bab-el-Mandeb as a bargaining chip, the Houthis may pursue closure on their own strategic logic — particularly if they perceive the ceasefire as collapsing [12]. The IISS assessment that the relationship is a "partnership" with "considerable autonomy" on the Houthi side means that Iranian de-escalation signals do not guarantee Houthi compliance [11].

Intelligence indicators that would distinguish credible preparation from posturing include: forward deployment of additional anti-ship missile batteries along Yemen's Red Sea coast, activation of Houthi naval mine-laying assets, increases in Iranian drone and missile shipments to Yemen, and changes in Houthi targeting patterns from selective (Israeli-linked vessels) to indiscriminate (all commercial traffic) [25]. As of mid-April 2026, some of these signals — particularly the "Hour Zero" declaration and resumed missile and drone launches toward Israel — have materialized, while others remain ambiguous [12][13].

What Comes Next

The collapse of the Islamabad talks on April 12, followed within hours by President Trump's announcement that the U.S. would impose its own blockade of Iranian ports, has pushed the crisis into a new phase [28]. The question is no longer whether Iran will threaten Bab-el-Mandeb, but whether the Houthis will act on the threat — and whether coalition forces can deter them without triggering the broader regional war that every party, publicly at least, claims to want to avoid.

The economic stakes are quantifiable. The strategic calculus is not. A quarter of the world's energy supply now depends on whether a partnership between Tehran and a Yemeni militia — a relationship that neither side fully controls — produces restraint or escalation at a 29-kilometer-wide passage that the ancient Arabs named the Gate of Tears.