The United States blocks the Strait of Hormuz, a clever but ultimately doomed move.

Author: Garrett

Translation: Shen Chao TechFlow

Shen Chao Guide: After the Iran-U.S. negotiations broke down, Trump announced that the U.S. Navy would blockade the Strait of Hormuz, bringing the “world’s most expensive toll station” operated by Iran for six weeks under U.S. control. This is Washington’s first proactive move since the outbreak of hostilities, but author Garrett believes that economic sanctions will not make Iran yield; instead, they will shrink diplomatic space and increase escalation risks. The article dissects the tactical logic of the blockade and four possible directions, highlighting the importance of tail risk pricing.

Trump has taken control of the Hormuz.

Not through peace agreements, not by reopening the strait. Quite the opposite—he shut it down.

On Sunday evening, after 21 hours of negotiations in Islamabad failed, Trump posted on Truth Social:

“Effective immediately, the U.S. Navy will initiate a blockade of all ships attempting to enter or exit the Strait of Hormuz.”

The U.S. Central Command confirmed: effective Monday at 10 a.m. Eastern Time. Covering all Iranian ports. All countries. No exceptions.

The world’s most critical energy choke point has just changed hands. Over the past six weeks, the Strait of Hormuz was Iran’s weapon. Tehran charged each passing ship $2 million, letting friends pass freely and blocking enemies, earning $139 million daily from oil revenue, while exports from neighboring countries plummeted by 80%.

Now, the U.S. Navy controls this choke point.

This is Trump’s smartest tactical move in this war. But it is almost certain not to succeed.

Weapon handover

There is a concept that precisely explains what just happened: the choke point effect. Whoever controls the critical node in the global network has leverage over all dependent parties.

Before the conflict, the U.S. was the “guardian” of Hormuz. Since World War II, the U.S. Navy kept the strait open, ensuring oil flows and the global economy functions. This role is a pillar of American dominance. Southeast Asian nations trust Washington’s freedom of navigation patrols in the South China Sea, Gulf monarchies invest their sovereign wealth in U.S. bonds—all because of this.

On February 28, Iran reversed the script. The moment U.S. and Israeli fighters bombed Iranian territory, Tehran closed the strait. It was a selective, strategic closure. Turning a 21-mile waterway into the world’s most expensive toll road.

For six weeks, Iran has controlled this choke point. Iran holds the leverage.

Trump just took it back.

This is much smarter than occupying Hark Island. The seized oil cargo could theoretically be sold on the open market, directly cutting Tehran’s income. The script is clear: blockade, interception, squeezing.

The logic on paper is straightforward. Iran is earning more during wartime than before, neighboring countries are bleeding, and the only way to reverse Iran’s economic advantage is to take away this weapon.

So Trump took it.

Why this move is clever

Fairly speaking, two points make this move tactically brilliant.

First, it reverses Iran’s economic calculus.

Before the blockade, Iran exported 1.7 million barrels of oil daily. At wartime inflated prices, that’s $139 million a day—more than before the conflict. Iraq’s exports fell by 80%. Saudi Arabia shifted all exports to a nearly full-capacity pipeline. Iran was the only oil-producing country in the Gulf making money during this war.

If the blockade is fully enforced, this income is wiped out.

Second, it’s cheaper than invasion.

Occupying Hark Island (Iran’s oil export hub) requires ground troops on enemy territory, exposed to all of Iran’s missile ranges. A maritime blockade allows distance. The U.S. has already deployed three aircraft carrier groups and over 18 missile destroyers in the theater. Infrastructure is in place.

Where’s the problem?

Don’t rush.

The real shift

Before discussing the issue, let’s digest what has happened above the tactical level.

Over the past six weeks, the U.S. has been reactive. Iran closed Hormuz, the U.S. called for negotiations. Iran set transit fees, the U.S. complained. Iran chose who could pass and who couldn’t, with the U.S. watching. The ceasefire was defined by Iran, with Pakistan as the venue, and Tehran’s opening bid as the initial offer.

The blockade breaks this pattern. Since February 28, Washington has set the terms of engagement for the first time, rather than responding to Tehran.

This is more important than it appears.

Controlling the choke point is not just about whose ships are on the water. It’s about who is perceived to be in control of the situation. Over six weeks, risk pricing by every shipping company, insurer, and oil trader has revolved around the assumption: Iran decides who can pass Hormuz. From 10 a.m. Monday, that pricing anchor has shifted. Now, the U.S. dictates.

Will the blockade leak? It will, but that’s almost a secondary issue. The key is the recalibration of the narrative. Markets, allies, and adversaries will adjust their behavior based on who holds the initiative. And for the first time since the war started, Washington is in control.

It’s worth pondering: over the past six weeks, the U.S. appeared as a superpower engaged in an uncontrollable war. Every TACO cycle (extreme threat, last-minute de-escalation, hollow “ceasefire”) reinforced an impression: Trump improvises. The blockade is the first move that looks like a “strategy” rather than a “reaction.” The U.S. is leading the rhythm, not following it.

This is crucial. In a conflict where perception and missile-like escalation dynamics matter, “who controls the initiative” is a variable that can move markets. It changes how allies hedge, how Beijing calculates, and how Tehran’s factions debate their next step.

But regaining the initiative does not mean winning. And the cost of this move might be greater than the move itself.

Why it probably won’t work

The core issue: the premise of the blockade is that economic pressure can force Iran back to negotiations. It won’t.

Iran has 88 million people, a battle-hardened Revolutionary Guard, near-nuclear capabilities, and a proxy network from Lebanon to Yemen to Iraq. This is not a regime that will be crushed by economic squeeze.

Four reasons:

1. Iran will not surrender; it will escalate

Bloomberg Economics published an assessment hours after the announcement: Iran will see the blockade as an act of war. The two-week ceasefire is effectively dead. Hardliners in the Revolutionary Guard will “resist” the urge to attack U.S. warships in the strait.

The Guard’s own statement confirms this: any “excuse” for approaching Hormuz with military vessels will be considered a violation of the ceasefire, “to be met with severe response.”

Supreme Leader Khamenei posted on Telegram: “Iran will push the management of the Strait of Hormuz into a new phase.”

This is not the language of a regime about to surrender.

2. China will not let Iran collapse

China imports 80% of Iran’s oil. Beijing has no interest in watching its main alternative oil supplier be strangled by U.S. naval power. Bloomberg points out the obvious: China can use its dominance in the rare earth supply chain as leverage.

China recently helped broker a ceasefire and invested $270 billion in the Middle East. It least wants Trump to decide who gets oil and who doesn’t.

Our judgment: China will find ways to keep Iranian oil flowing. Shadow fleets, ship-to-ship transfers, land routes through Pakistan and Turkey—these are the playbooks for Iran sanctions. The blockade makes operations harder but not impossible.

3. The blockade itself has loopholes

Careful reading of the CENTCOM statement reveals the escape hatch:

“CENTCOM forces will not interfere with the free passage of ships transiting to and from non-Iranian ports through the Strait of Hormuz.”

In other words, a Chinese oil tanker leaving Oman, passing through Hormuz en route to Shanghai? Not blocked. The U.S. only blocks Iranian ports, not the strait itself. This distinction is critical. Flagged Iranian ships, cargo at non-Iranian docks, transshipment through third-party ports: flexible options exist.

Most countries’ oil export infrastructure is centralized and exposed. Iran’s is dispersed, and it already has six weeks of experience operating a gray market for oil.

4. Escalation is a two-way street

This is the part that should keep you awake.

If the blockade truly hits Iran’s revenue, Tehran’s options extend beyond Hormuz.

Red Sea: Iran’s Houthi proxies in Yemen have already demonstrated their ability to disrupt the Bab el-Mandeb Strait, the southern choke point of the Red Sea. In 2023-24, Houthi attacks forced global shipping to reroute around Africa. Bloomberg warns: “The blockade could trigger Houthi action against the Bab el-Mandeb.” Saudi Arabia just reopened the Red Sea export pipeline. Timing is unfortunate.

Gulf infrastructure: Iran has already attacked regional energy infrastructure. The 2019 drone attack on Abqaiq halved Saudi Arabia’s capacity at a cost of a fraction of Patriot interceptors. If Iran decides “no one sells oil,” tools are cheap and mature.

Nuclear breakthrough: This is the real reason negotiations broke down. Vance says Iran refuses to promise not to pursue nuclear weapons. If Iran believes economic strangulation is inevitable, the incentive to rush nuclear development only grows.

Cold but clear logic: a regime pushed to the brink with nothing to lose will not negotiate; it will escalate.

Paradox

Here’s the interesting part for markets.

The goal of the blockade is to accelerate ending the war by squeezing Iran’s economy. But the most likely effect is the opposite: it prolongs the war by removing Iran’s incentive to negotiate.

Before the blockade, Iran had leverage (Hormuz) and income (oil exports). It was negotiable; it had something to exchange.

After the blockade, Iran loses income but gains nothing. Hormuz is no longer a bargaining chip Iran can offer. Iran’s remaining options are its nuclear program and proxy networks. Tehran will not voluntarily give these up.

Diplomatic space shrinks, not expands.

And there’s a deeper paradox. Blocking Hormuz means the U.S. has just violated the principle it has defended for 80 years.

Let’s be blunt: if the U.S. can shut down Hormuz when it suits its interests, what’s to stop the PLA Navy from pushing further in the South China Sea? What’s to stop anyone?

The U.S. has not failed to keep Hormuz open. It chose to close it. That’s a different matter. And the precedent it sets is worse.

The U.S. was once the lock. Now it’s the key. Once you show the world that the maritime guardian is willing to weaponize its control, you can’t take it back.

Four oil price scenarios

We don’t predict. We prepare. Here’s the decision matrix.

Chart: Decision matrix of four scenarios, with the vertical axis representing blockade effectiveness and the horizontal axis representing Iran’s response.

Chart interpretation: The author divides four scenarios based on “whether the blockade effectively tightens” and “whether Iran escalates”:

Scenario 1 (Effective blockade + Iran concedes): Iran’s economy collapses, returns to negotiations, lowest probability.

Scenario 2 (Leakage + Iran does not escalate): Baseline. China maintains Iran’s economic lifeline; the blockade becomes a chronic attrition, oil prices stay at $95-120.

Scenario 3 (Tightening blockade + Iran escalates): Tail risk, about 25% probability. Revolutionary Guard attacks U.S. ships or Houthi blocks the Strait of Mandeb, full-scale conflict, oil prices surge, market impact 3-5 times the baseline.

Scenario 4 (Leakage + Iran escalates): The blockade is effectively ineffective but Iran chooses to retaliate; chaos ensues without economic logic support, a chaotic scenario.

Our baseline: Scenario 2, a stalemate attrition war.

Iran will not surrender because it cannot. Surrendering over nuclear and Hormuz issues equals regime collapse. China will find ways to sustain Iran’s oil flow. The blockade becomes another layer of pressure, not a fatal blow. Oil prices stay in the $95-120 range. The war continues.

But for positions, the key is: Scenario 3 is a 25% tail event, with market impact 3-5 times the baseline. This asymmetry is why we continue to be long on oil, gold, and defense stocks. The tail’s expected value exceeds the baseline’s.

This week’s focus

Monday, 10 a.m. Eastern: Blockade takes effect. First 24 hours of data. How many ships are turned back? Will China test the boundaries?

Iran’s response: Revolutionary Guard statement says any approaching ships violate the ceasefire. Watch for drone or missile provocations. First shot at U.S. ships = acceleration of Scenario 3.

Oil opening: Sunday night Brent futures. The size of the gap indicates market confidence in the blockade.

China’s moves: Will Beijing issue an official statement? Will it send naval escorts for oil tankers? The timeline of shadow fleet activation is a key variable.

IMF Spring Meetings (April 13-18): Global finance ministers gather in Washington. The conversations in the corridors matter more than the official communiqués. Are they coordinating responses or acting independently?

Bottom line

Trump has just played the smartest move in this war. He took Iran’s weapon away and turned it against Iran.

But smart does not mean effective.

The success of the blockade depends on Iran surrendering under economic pressure, accepting U.S. terms, abandoning nuclear ambitions, and reopening Hormuz on Washington’s schedule.

Iran will not surrender. It has proxies in four countries, near-nuclear plans, a population of 88 million forged by revolution, and a Beijing that will not sit idly by as it is strangled.

The most likely outcome: the blockade becomes another chapter in a war with no clean ending. Oil prices stay high. Chain reactions continue. The world adapts to a new normal—one where the country that built the global shipping order is now the disruptor.

This is not a stable equilibrium. Something will break first: Revolutionary Guard provocations, China’s escort fleets, U.S. ground deployments, Trump’s policy reversals, or an unexpected second round of negotiations. The blockade is a move, not the endgame. Every move in this war triggers the next escalation faster than the last.

Markets have priced in the blockade. But they have not priced in what comes after it.