Editor's Note: On April 12, after 21 hours of continuous US-Iran negotiations collapsed, Trump announced that the US Navy would blockade all ships entering and exiting the Strait of Hormuz. Subsequently, US Central Command confirmed that the measure would take effect on Monday morning at 10 am Eastern Time, covering all Iranian ports and applying to all countries. At that moment, the world's most critical energy chokepoint experienced a power shift.
Tactically, this was a "smart" move: without the need for occupation or destruction, the US directly took away Iran's most effective tool in the past six weeks — control of the Strait of Hormuz — and turned it into a means of reverse pressure. The blockade also reset the narrative, allowing the US to regain the initiative.
However, this is not a war that can be ended through a single "smart move." The blockade, while weakening Iran's revenue, also squeezed the negotiation space. As exchangeable bargaining chips diminish, conflict is more likely to escalate.
A deeper change lies at the level of order. For decades, the US has built trust in the global trade and energy system based on "maintaining open sea lanes"; this time, it chose to actively close the passage. When the "gatekeeper" begins to weaponize sea lanes, the risk pricing logic between markets and states also changes.
Therefore, while the blockade may alter short-term gains, it is difficult to touch the fundamental constraints of the conflict. A more likely outcome is a longer-lasting attrition and accumulating tail risks.
The following is the original text:
Trump "took" the Strait of Hormuz.
Not through a peace agreement, nor by reopening the passage, but rather the opposite, he chose to blockade it himself.
On Sunday night, after 21 hours of negotiations in Islamabad ended in failure, Trump announced on Truth Social: "Effective immediately, the US Navy will initiate a blockade procedure against all ships attempting to enter or exit the Strait of Hormuz." The United States Central Command (CENTCOM) then confirmed: the measure would take effect at 10 am Eastern Time on Monday, covering all Iranian ports, applying to all countries without exception.
This most critical global energy chokepoint has changed hands in this way.
Over the past six weeks, the Strait of Hormuz has been Iran's weapon. Tehran charged $2 million per passing ship, allowing allies through and blocking foes. As neighboring exports plummeted by 80%, Iran made $139 million a day from oil.
Now, that chokepoint is under U.S. Navy control.
This is Trump's smartest tactical move in the war, but it's almost certain not to work.
Weapon Transfer
There's a concept that can accurately describe what just happened: the "chokepoint effect." In a global network, whoever controls a key node has the ability to exert pressure on all those reliant on it.
Prior to the conflict, the U.S. was the guardian of the Strait of Hormuz. Since World War II, the U.S. Navy has kept the strait open, allowing oil to flow, and the global economy to function. This role has been a cornerstone of the Pax Americana, which is why Southeast Asian nations trust Washington's "freedom of navigation" operations in the South China Sea and Gulf monarchies are willing to park sovereign wealth in U.S. Treasuries.
Iran rewrote these rules on February 28. When the U.S. struck Iran's mainland, Tehran chose to close the strait—not completely, but selectively and strategically. This 21-mile waterway turned into the world's most expensive "toll road."
For these six weeks, Iran controlled this key node and thus had coercive power.
And Trump just took it back.
Compared to seizing directly the Kharg Island (Iran's oil export hub), this is a smarter choice. In theory, the impounded oil can be resold on the open market, cutting Tehran off from its revenue chain. The whole strategy can be summed up as: blockade, intercept, pressure.
On paper, the logic is clear: Iran makes more money in the war than before, while its neighbors bleed. To turn Iran's economic advantage into a burden, the only way is to take away its "weapon."
So, Trump did.
Why This Is a Masterstroke
Objectively, this move is tactically brilliant for two key reasons.
First, it reverses Iran's economic structure.
Before the blockade, Iran was exporting around 1.7 million barrels of oil per day. With oil prices soaring during wartime, this meant daily revenue of $139 million, even higher than pre-war levels. Meanwhile, Iraq's exports plummeted by 80%, and Saudi Arabia was forced to reroute shipments through pipelines operating at near full capacity.
Across the Gulf region, Iran was almost the sole oil-producing country benefiting continuously from the war. If the blockade were to be enforced, this revenue would be directly reduced to zero.
Second, it is lower cost compared to invasion.
If seizing the island of Qeshm was chosen, it would mean the need for ground forces to be stationed long-term in hostile territory and within range of Iranian missiles. On the other hand, a naval blockade can be maintained through "standoff operations." Currently, the U.S. military has deployed three carrier strike groups and over 18 missile destroyers in the region, with the infrastructure already in place.
So, this strategy seems to have almost no downsides. But let's not rush to conclusions yet.
Real Change
Before delving into the issue, it is necessary to first observe a change at a higher level than tactics.
Over the past six weeks, the U.S. has consistently been in a passive state. Iran closed the Strait of Hormuz, and the U.S. called for negotiations; Iran set passage fees, and the U.S. expressed dissatisfaction; Iran decided who could pass and who couldn't, with the U.S. only able to watch from the sidelines. The ceasefire framework was set by Iran, the negotiation location in Pakistan was also Iran's preference, and the "Ten-Point Plan" was Tehran's initial proposal.
However, this blockade has disrupted this pattern.
Since February 28, this is Washington's first time taking the initiative to set the rules of engagement, rather than responding to Tehran. This point is more significant than it appears.
Control over a "chokepoint" has never been just about who has ships on the sea surface but more crucially about who the world believes is in control of the situation.
Over the past six weeks, all shipping companies, insurance firms, and oil traders have priced risk based on one assumption: Iran decides who can pass through Hormuz. However, starting Monday morning at 10 a.m. Eastern Time, this "pricing anchor" has been completely reversed, and decision-making power has returned to the U.S.
Whether the blockade will have loopholes (which is almost certain to happen) is actually a secondary issue. The truly key point is the reset of the narrative. The market, allies, adversaries—all will readjust their behavior based on "who holds the initiative." And right now, in this war, for the first time, the initiative has returned to Washington.
This is a point worth taking seriously.
Over the past six weeks, the United States has looked more like a superpower at war but unable to control the situation. Each round of the "TACO Cycle" — extreme pressure, temporary concession, illusory "ceasefire" — has only reinforced an impression: Trump is improvising rather than strategically advancing.
And this blockade is the first that looks like a "strategic" move, not a "reaction." It's also the first time the U.S. is setting the pace, not passively following.
It's not insignificant.
In a conflict where "cognition also determines the escalation path," initiative itself is a variable that affects the market. It will change allies' hedge approaches, alter China's calculus, and influence the internal debate within different factions in Tehran about the next steps.
However, seizing the initiative does not equal winning the war. And the cost of this proactive move may be greater than the action itself.
Why It Won't Work
The issue is actually simple: the premise of this blockade is that economic pressure will force Iran back to the negotiating table.
But it won't.
Iran has a population of 88 million, a battle-hardened Revolutionary Guard, near-nuclear-threshold capabilities, and a proxy network from Lebanon to Yemen to Iraq. This is not a regime that will bend to economic pressure.
There are four reasons for this.
1. Iran Will Not Back Down, Only Escalate
Bloomberg Economics Research made a judgment within hours of the announcement: Iran will see the blockade as an act of war. The so-called "two-week ceasefire" has effectively collapsed. The hard-line factions of the Islamic Revolutionary Guard Corps (IRGC) are likely to view an attack on U.S. vessels as an "irresistible option."
The IRGC's own statement confirms this: any military vessel approaching the Strait of Hormuz "under any pretext" will be deemed a violation of the ceasefire and met with a "harsh response." Supreme Leader Ayatollah Khamenei posted on Telegram: "Iran will bring the management of the Hormuz Strait into a new phase."
This is not the language of a regime prepared to compromise.
2. China Will Not Let Iran Be "Choked Out"
China imports 80% of its oil from Iran and cannot afford to see its key alternative oil source "choked off" by the U.S. Navy. Bloomberg Economics Research highlighted the most direct countermeasure: China can use its dominance in the rare earths supply chain to exert pressure on Washington.
China has just helped broker a ceasefire, with investments in the Middle East reaching $270 billion. What they least want to see is Trump controlling global oil allocation.
A more realistic assessment is: China will find ways to keep Iranian oil flowing, whether through shadow fleets, ship-to-ship transfers, or overland routes via Pakistan or Turkey. These methods have appeared in every previous round of sanctions on Iran.
A blockade will only increase complexity, not halt the flow.
3. The Blockade Itself Has Vulnerabilities
Even in the US Central Command's statement, the "exit" has already been laid.
It was written as follows: "CENTCOM forces will not impede the free flow of vessels transiting to and from non-Iranian ports through the Strait of Hormuz." This means that a Chinese oil tanker departing from a port in Oman and heading to Shanghai via the Strait of Hormuz will not be intercepted.
The US is blockading Iranian ports, not the entire strait. This difference is crucial. Evasion routes such as Iranian-affiliated vessels flying "convenience flags," loading at non-Iranian docks, and transshipping through third-party ports are all real.
Most countries' oil exports are highly concentrated and easy to target; Iran's export system is more diversified and has been operating a "gray market" system for six weeks.
4. The Escalation Ladder is Bidirectional
This is the truly alarming part. If the blockade truly starts hurting Iran's revenue, Tehran's retaliatory measures go far beyond the Strait of Hormuz.
Red Sea direction. Iran-backed Houthi forces in Yemen have already demonstrated the ability to disrupt key nodes at the southern end of the Red Sea—the Bab el Mandeb strait. Between 2023 and 2024, Houthi attacks forced global shipping to detour around Africa. Bloomberg Economics warns, "A blockade could trigger Houthi actions in the area." And recently, Saudi Arabia just restarted its Red Sea oil pipeline, a very inopportune moment.
Gulf infrastructure. Iran has repeatedly targeted energy facilities in the region. The 2019 attack on Saudi Aramco's Abqaiq plant, using drones with a cost far below that of Patriot interceptors, destroyed half of Saudi Arabia's production capacity. If Iran decides "no one can sell oil," its tools are both cheap and mature.
Nuclear breakout. This is the core reason for the breakdown in negotiations. Iran has refused to commit to not developing nuclear weapons. If Iran believes it will face economic strangulation regardless, then accelerating towards nuclear weapons may ironically become a more attractive option.
The logic is cold but clear: a cornered regime that has nothing left to lose will not negotiate — only escalate.
Paradox
For the market, what is truly worth paying attention to is the reverse logic here.
The original design of this blockade was to hasten the end of the war by crushing the Iranian economy. But the most likely outcome is quite the opposite; it will prolong the war as it removes Iran's incentive to negotiate.
Prior to the blockade, Iran held both leverage (Hormuz) and revenue (oil exports). It had the ability to negotiate and something to exchange.
After the blockade, Iran lost its revenue but did not gain any new leverage. Hormuz is no longer a card it can play in negotiations. Its remaining negotiation leverage is only the nuclear program and its proxy network.
Yet these are two things that Tehran has never been willing to voluntarily give up. The diplomatic space has not expanded but rather contracted.
There is an even deeper paradox.
By blockading Hormuz, the U.S. has effectively violated a principle it has upheld for the past 80 years.
To put the question more bluntly: if the U.S. can close Hormuz when it serves its interests, what is stopping
the Navy from taking one more step forward in the South China Sea? What is stopping other countries from following suit? The U.S. did not "fail to keep Hormuz open"; it actively chose to close it. These are two entirely different things, with the former having far-reaching consequences.
In the past, the U.S. held the "lock"; now, it has become the "key." Once the world sees the country responsible for safeguarding maritime passages willing to weaponize them, this perception cannot be erased.
Four Scenarios
We do not predict; we prepare. Next is the decision matrix of this game.
Our baseline assessment is: Scenario Two — Prolonged Stalemate.
Iran will not back down because it cannot. Conceding on the nuclear and Hormuz issues would be tantamount to regime suicide. China will sustain its economic lifeline through various indirect means. The blockade will only add an extra layer of pressure, not a decisive blow. Oil prices will remain in the $95 to $120 range, with the war continuing to erode and drag on.
However, for positioning, the key is: Scenario Three, although only a 25% probability, carries 3 to 5 times the market impact of the baseline scenario. It is this asymmetry that leads us to maintain a long position in oil, gold, and defense sectors. The expected value of the tail scenario is higher than the baseline scenario.
Focus This Week
· Monday 10 a.m. ET: Blockade officially enforced. Watch closely for the first 24-hour execution data — how many vessels were intercepted? Is China testing the boundaries?
· Iranian Reaction: The Revolutionary Guard has stated that any approach will be seen as violating the ceasefire. Watch for drone or missile probes. Once there is a substantive first attack against a US warship, Scenario Three will escalate rapidly.
· Oil Market Opening: Brent crude futures performance on Sunday night. The magnitude of any gap will reflect the market's assessment of the blockade's "reality."
· Chinese Actions: Will Beijing issue a public statement? Will they provide naval escorts for tankers? The pace of the "shadow fleet" deployment will be a key variable.
· IMF Spring Meetings (April 13–18): Global fiscal and central bank officials gather in Washington. Of real interest will be off-site interactions — are countries coordinating responses or going solo?
Conclusion
Trump has just made the smartest move in this war — he has taken away Iran's "weapon" and turned it against them.
But "smart" does not equal "effective." This blockade will only work if the following conditions are met simultaneously: Iran concedes under economic pressure, accepts US terms, abandons its nuclear program, and reopens Hormuz at Washington's pace.
But Iran will not yield. It has a proxy network spanning four countries, near-nuclear-threshold capabilities, a revolutionary national identity of 88 million, and a China that will not stand idly by as it is strangled.
The more likely outcome: the blockade becomes another phase in this war with no clear end. Oil prices stay high, chain reactions continue to spread, and the world gradually adjusts to a new normal where the country that once established global shipping order is now disrupting it.
This is not a stable equilibrium. At some point, a link will break, possibly the Revolutionary Guard's provocation, the appearance of a foreign escort fleet, US ground intervention, Trump's policy reversal, or a round of new negotiations that no one is really optimistic about.
The blockade is just one move, not the endgame. And in this war, every move will trigger new escalations faster than the last.
The market has already priced in the "blockade" itself, but has not yet priced in the chain reaction that will follow.
