New Iranian Supreme Leader Vows Strait of Hormuz to Remain Closed

Twelve days after U.S. and Israeli forces launched the most devastating military strikes against Iran in modern history, the son of the assassinated Supreme Leader has issued his first public message — and it carries a warning that threatens to plunge the global economy into crisis.

Mojtaba Khamenei, appointed as Iran's third supreme leader on March 8 by the Assembly of Experts, declared on March 12 that the closure of the Strait of Hormuz must continue as a "tool to pressure the enemy" [1]. He further demanded the immediate shutdown of all U.S. military bases in the Middle East, warning of further attacks against Western interests [2].

The statement, broadcast on Iranian state television, eliminates any hope for a swift diplomatic resolution to the worst disruption of global energy supplies in half a century. Oil markets reacted immediately: Brent crude climbed toward $100 per barrel, while WTI settled above $94 — prices that would have seemed unthinkable just two weeks ago, when crude was trading below $67 [3].

The 12 Days That Shook the World

The crisis traces its origins to the early hours of February 28, 2026, when the United States and Israel launched Operation Epic Fury — a coordinated military campaign involving nearly 900 strikes across Iran over 12 hours [4]. The targets included nuclear facilities, missile infrastructure, air defense systems, and, critically, the senior leadership of the Islamic Republic.

At 2:30 a.m. EST, President Donald Trump released an eight-minute video statement on Truth Social declaring the purpose of the strikes was effectively regime change [5]. Within hours, the strikes achieved their most consequential objective: the assassination of Supreme Leader Ali Khamenei in Tehran. Iranian state media confirmed his death on March 1 [6].

The response from Iran was swift and devastating — not on the battlefield, but on the water.

Within hours of the first strikes, the Islamic Revolutionary Guard Corps transmitted VHF radio warnings to all vessels in the Strait of Hormuz, declaring that no ships would be permitted to pass [7]. What began as verbal threats quickly became physical reality: tanker transits collapsed from 24 daily vessels to just 4 within 24 hours — an 83% reduction — before dropping to effectively zero [3]. Over 150 ships anchored outside the strait rather than risk passage. Shipping insurance rates surged four to six times their pre-crisis levels by March 9 [8].

The Chokepoint That Holds the World Hostage

The Strait of Hormuz, a narrow waterway just 21 miles wide at its most constrained point between Iran and Oman, is the most critical energy chokepoint on earth. In 2024, approximately 20.7 million barrels of oil passed through it daily — roughly 25% of all seaborne oil trade [9]. About 20% of global liquefied natural gas trade also transits the strait, primarily from Qatar, which routes 93% of its LNG exports through the passage [10].

The dependence falls most heavily on Asia: 84% of the crude oil and condensate moving through Hormuz is destined for Asian markets, with China alone accounting for 37.7% of total flows [9]. This dependency explains why Beijing has attempted to negotiate privileged access for its vessels — and why Iran initially announced on March 5 that ships from China, Pakistan, and Russia would be permitted to pass while Western vessels would be blocked [11].

Source: U.S. Energy Information Administration / Visual Capitalist

Data as of Mar 12, 2026CSV

In practice, however, even this selective policy has proved largely theoretical. Since March 1, only two Chinese-flagged ships have been observed transiting the strait [12]. In a bizarre twist, ships throughout the Persian Gulf have begun changing their AIS tracking data to claim Chinese ownership or all-Chinese crews in an attempt to gain safe passage — a maritime identity crisis that underscores just how desperate the situation has become [13].

A Dynasty of Defiance

The man now directing this confrontation represents an unprecedented concentration of power in Iran's post-revolutionary history. Mojtaba Khamenei, born in 1969, is the second child of Ali Khamenei and the first supreme leader to assume power through direct hereditary succession — something his father publicly opposed [14].

Despite his low profile, the younger Khamenei has been described as wielding immense behind-the-scenes power for years, from crushing dissent during the 2022 Mahsa Amini protests to influencing presidential elections [15]. He joined the Islamic Revolutionary Guard Corps in the late 1980s during the Iran-Iraq War, forging relationships within the security establishment that became his core power base.

His personal story now carries an additional dimension of grievance that makes diplomatic engagement even more fraught: the February 28 strikes killed not only his father but also one of his children, his mother, one of his sisters, and his wife [15]. The succession, completed in just eight days, was reportedly contested — Ali Khamenei had nominated three alternative clerics in case of his assassination — but Mojtaba's IRGC connections and the wartime urgency of the moment prevailed [6].

Analysts describe Mojtaba Khamenei as more hardline and conservative than his father. President Trump expressed "disappointment" at his selection, a notable statement from an administration that had hoped the strikes would produce a more pliant successor [14].

The Oil Price Shock

The economic consequences have been staggering. WTI crude oil surged 35% in a single week — the largest weekly gain in futures trading history dating back to 1983 [3]. The trajectory has been relentless: from $66.96 on February 27, the last trading day before the strikes, to $94.65 by March 9, with Brent crude approaching the psychologically critical $100 mark on March 12 [16].

Source: FRED / U.S. Energy Information Administration

Data as of Mar 11, 2026CSV

The disruption extends far beyond crude oil prices. Iraq has shut down 1.5 million barrels per day of production after running out of storage capacity, and Kuwait has begun cutting output for the same reason [3]. The International Energy Agency has declared this the "largest supply disruption" in its history [17].

Iran's IRGC has warned that "not a litre of oil" will pass through the strait, with Iranian officials threatening that prices could reach $200 per barrel if the blockade continues [18]. According to the International Monetary Fund, every 10% rise in oil prices translates to a 0.4 percentage point increase in inflation and a 0.15 percentage point reduction in economic growth — suggesting the current spike could shave nearly half a point off global GDP [3].

Emergency Measures and Their Limits

On March 11, the IEA announced the largest coordinated emergency reserve release in its 52-year history: 400 million barrels from the strategic stockpiles of its 32 member nations [19]. The United States will contribute the largest share — 172 million barrels from the Strategic Petroleum Reserve, to be delivered over approximately 120 days [20].

The scale is more than double the 182.7 million barrels released in 2022 in response to Russia's invasion of Ukraine [19]. Yet analysts immediately noted that the release alone cannot substitute for the daily volumes lost. With roughly 20 million barrels per day normally transiting Hormuz, even 400 million barrels represents only 20 days of lost supply.

Saudi Arabia has activated bypass infrastructure, using the Petroline pipeline to move crude westward to the Red Sea and through the SUMED pipeline to the Mediterranean — effectively circumventing the Arabian Peninsula entirely [3]. But these alternative routes have limited capacity and cannot replace the full volume that normally flows through Hormuz.

Markets have responded to the IEA announcement with skepticism. Oil prices continued to climb even after the reserve release was confirmed, a signal that traders believe the disruption will outlast the emergency measures [21].

Military Realities

The U.S. military is actively engaged in the strait but faces significant operational challenges. On March 11, CENTCOM announced the destruction of 16 Iranian mine-laying vessels near the Hormuz passage [22]. But the same day, a cargo ship was struck by a projectile in the strait, catching fire — a stark illustration that destruction of individual vessels has not eliminated the threat [23].

A senior U.S. military official acknowledged on March 12 that American forces are "not ready" to escort commercial oil tankers through the strait, with assets currently focused on degrading Iran's offensive capabilities rather than providing convoy protection [24]. CENTCOM has warned civilians to avoid Iranian port facilities along the strait, stating that civilian ports used for military operations lose their protected status under international law [25].

The underlying strategic dilemma is clear: even with overwhelming conventional superiority, the United States cannot simultaneously prosecute a military campaign against Iran and guarantee safe passage for commercial shipping through waters that Iran can threaten with mines, missiles, and fast-attack boats from positions just miles away.

The China Factor

Beijing's role has emerged as one of the most complex dimensions of the crisis. China is Iran's largest oil customer, purchasing virtually all of Iran's pre-war exports of 2.16 million barrels per day [12]. Tehran's selective access policy — ostensibly permitting Chinese, Russian, and Pakistani vessels to pass — appears designed to maintain this relationship while weaponizing the strait against Western economies.

Yet the reality has fallen short of the rhetoric. Iran's oil shipments to China have dropped from 2.16 million barrels per day in February to approximately 1.22 million barrels per day since the conflict began [12]. The strait remains too dangerous for most commercial vessels regardless of their flags, and the IRGC's mine-laying operations have created indiscriminate hazards.

A CSIS analysis published on March 10 concluded bluntly: "No One, Not Even Beijing, Is Getting Through the Strait of Hormuz" [26]. China has reportedly entered direct negotiations with Tehran to guarantee safe passage for its energy supplies, but no verifiable agreement has been reached [27].

What Comes Next

Mojtaba Khamenei's declaration that the blockade will continue transforms an acute crisis into what may become a prolonged global economic emergency. With the new supreme leader framing the closure as a strategic weapon rather than a temporary retaliatory measure, the path to reopening the strait likely requires either a ceasefire agreement that neither side appears willing to pursue, the physical degradation of Iran's ability to threaten the waterway, or a bypass strategy that reroutes enough global energy supply to make the blockade economically irrelevant.

None of these outcomes is achievable quickly. The EIA forecasts Brent crude will remain above $95 per barrel for at least the next two months [16]. If the blockade persists beyond the 120-day window of the strategic reserve release, the world faces the prospect of sustained triple-digit oil prices and the stagflationary pressures that historically accompany them.

For the 4.5 billion people in Asia who depend on energy flowing through the Strait of Hormuz, and for a global economy already fragile from years of pandemic recovery and trade disruption, the message from Tehran is unmistakable: the world's most important oil chokepoint is now a weapon of war, and the man who controls it has every reason — personal and political — to keep it closed.