„Öffnet die verdammte Straße von Hormus“ – Trump hat sie bombardiert und geschlossen

Key Takeaways

• Trump’s own words are the indictment: His April 5 Truth Social demand, “Open the Fuckin’ Strait, you crazy bastards,” is an admission. You cannot demand that someone reopen a waterway that was open before you started bombing.
• The Carter Doctrine committed the United States to keeping Hormuz open. For 46 years every president used force to enforce that rule. Trump is the first to use force in a way that closed it.
• The Strait was closed by two hands at once. Iranian mines and IRGC speedboat attacks on one side, Lloyd’s of London war-risk underwriters on the other. Both were downstream of a single decision made in Washington on February 28, 2026.
• Iran has set a price. Tehran now says the Strait will stay closed until war damages are paid under a new transit-fee framework. The Carter Doctrine just became a toll booth, and Iran is running the booth.

The Easter Sunday Tantrum

On Easter Sunday, April 5, 2026, the President of the United States opened Truth Social and typed the following sentences. Trump has a long track record of unhinged holiday posts, and this one will be remembered.

Tuesday will be Power Plant Day, and Bridge Day, all wrapped up in one, in Iran. There will be nothing like it!!! Open the Fuckin’ Strait, you crazy bastards, or you’ll be living in Hell. JUST WATCH! Praise be to Allah. President DONALD J. TRUMP

Read the second sentence again. Slowly.

The President of the United States is demanding that the Islamic Republic of Iran reopen the Strait of Hormuz. He is threatening to bomb power plants and bridges on Tuesday unless they do. And the part the market cannot unsee is this: on February 27, 2026, the Strait of Hormuz was open. Ninety-one ships per day were moving through it. Roughly 20 million barrels of crude oil, or about 20 percent of global petroleum liquids consumption, were transiting that 21-mile-wide chokepoint between the Persian Gulf and the Gulf of Oman.

On February 28, the United States and Israel launched Operation Epic Fury. The strait did not close itself. Iran did not strike first. Trump did. And now, five weeks later, he is on Truth Social demanding that the country he bombed first unbomb the consequences.

This is the article about what that sentence actually means for oil, for insurance markets, and for the 46-year-old American doctrine that has just been turned inside out.

The Carter Doctrine, In His Own Words

On January 23, 1980, Jimmy Carter stood in front of a joint session of Congress, looked into the cameras, and committed the United States military to the defense of Persian Gulf shipping lanes in a single sentence.

An attempt by any outside force to gain control of the Persian Gulf region will be regarded as an assault on the vital interests of the United States of America, and such an assault will be repelled by any means necessary, including military force.

That sentence became known as the Carter Doctrine. It was drafted in response to the Soviet invasion of Afghanistan a month earlier, but its operational meaning extended immediately to the Strait of Hormuz. The commitment was unambiguous. The United States would use force, up to and including war, to keep the strait open. Not to close it. To keep it open.

For forty-six years, every American president (Republican and Democrat, hawk and dove) honored that commitment in practice. Reagan honored it. Bush honored it. Clinton honored it. Both Bushes honored it. Obama honored it. Biden honored it. Trump, in his first term, honored it.

Then, on February 28, 2026, he stopped.

How It Worked For 46 Years

The doctrine has a track record, and that track record tells you what the “normal” American response to threats against Gulf shipping has always looked like.

In July 1987, at the peak of the Iran-Iraq War’s “Tanker War” phase, the Reagan administration launched Operation Earnest Will. Eleven Kuwaiti oil tankers were reflagged under U.S. registry and escorted through the Persian Gulf by U.S. Navy warships. The first reflagged tanker, the Bridgeton, began its escorted transit on July 22, 1987. Over roughly fourteen months, U.S. Navy forces conducted approximately 250 convoy operations. The mission was explicit. Keep the oil moving.

On April 14, 1988, the frigate USS Samuel B. Roberts struck an Iranian mine in the central Persian Gulf. Four days later, on April 18, the United States retaliated with Operation Praying Mantis. In a single afternoon of combat, U.S. forces sank the Iranian frigate Sahand, sank the Iranian missile boat Joshan, damaged the frigate Sabalan, and destroyed two Iranian oil platforms being used as military command posts. It was the largest surface naval engagement fought by the U.S. Navy since World War II.

Through all of that (a multi-year Tanker War in which roughly 450 merchant vessels were attacked by Iran or Iraq, Iranian mining campaigns, and Silkworm missiles fired from the Iranian coast) the Strait of Hormuz stayed open. Traffic dipped. Insurance premiums rose. Shipping rerouted. But the strait stayed open. That was the whole point. That was the doctrine.

The United States did not fight those battles to close the strait. It fought them to keep the strait open against people who were trying to close it. You want to hold that distinction in your head, because Operation Epic Fury inverted it.

February 28: The Doctrine Inverted

On February 27, 2026, the Strait of Hormuz was flowing normally. On February 28, the United States and Israel launched air and missile strikes against Iranian nuclear, military, and industrial targets. The stated objective was to “neutralize Iran’s nuclear program and degrade its military capacity.” Nothing about keeping the strait open. The strait was already open. Operation Epic Fury was a war of choice launched against a country whose navy had not attacked Gulf shipping, whose mines had not been laid, and whose IRGC speedboats had not harassed a tanker in weeks.

By the end of the day on March 1, commercial shipping traffic through the strait had dropped roughly 70 percent. By March 4, the Protection and Indemnity clubs in London, which provide liability coverage to roughly 90 percent of the world’s ocean-going tonnage, had pulled or effectively priced out war-risk cover for Gulf transits. Traffic collapsed from 91 ships per day to between three and four.

That is a closed strait. Not formally closed. Not closed by a treaty or a blockade declaration. But functionally closed, closed the way a road is closed when everyone who drives on it for a living has decided it is not worth the crash.

And the person who closed it is the person currently demanding on Truth Social that it be reopened.

Two Ways to Close a Strait

Credit where it is due. Iran retaliated, and the retaliation was real. In the days following the February 28 strikes, the IRGC carried out small-boat attacks on tankers near the strait, deployed sea mines in approach lanes, and threatened further action against any vessel interpreted as supporting the U.S. or Israeli war effort. That kinetic campaign was genuine. Iran blew up ships. Iran mined shipping lanes. Iran did not attack first, but once Epic Fury began, Iran fought back in the water.

The kinetic campaign is only half the closure, though. The other half is financial, and it happened in London.

Marine war-risk cover for Persian Gulf voyages is underwritten primarily by Lloyd’s syndicates and the Protection and Indemnity clubs. When the joint war committee at Lloyd’s declares a zone a “listed area,” premiums spike. When premiums spike past the point at which a voyage is economically rational, shipowners cancel charters. When the Protection and Indemnity clubs suspend war-risk cover entirely, which began happening in the first week of March, the ship simply cannot sail. No bank, no charterer, and no flag state will allow an uninsured vessel to enter the zone.

In other words, Iran closed the strait with mines, and London closed the strait with spreadsheets. Both effects were downstream of a single event. Neither would have happened if the February 28 strikes had not happened. The strait was open on February 27. The strait is closed now. The variable that changed was Washington’s decision.

Iran’s Answer: The Toll Booth

Iran responded to Trump’s post within hours, and the response deserves your full attention. It reframes the entire crisis.

An Iranian official quoted on state broadcaster IRIB said Trump, acting out of “despair and anger,” was repeating “delusional claims” about who had closed the Strait of Hormuz. Then the official made the real announcement. The Strait, per Tehran, will remain closed until war damages are compensated under a new transit-fee framework.

Read that sentence slowly too. Tehran is no longer framing the closure as the collateral damage of an unfinished war. It is framing the closure as a reparations mechanism. Iran is proposing, as official state policy, that ships wanting to move crude through the strait pay Iran a fee, and that the aggregate of those fees be treated as compensation for the damage done by Operation Epic Fury.

The Carter Doctrine, in its 1980 form, committed the United States to guaranteeing free navigation through the Persian Gulf at the point of a gun. What Iran just proposed is the logical inversion. Iran controls the chokepoint. Iran sets the fee. The United States, having started the war that handed Tehran that position, is now on the wrong side of a toll booth it built for its own enemy.

The framing is shrewd on two separate levels. On one hand, it converts a military stalemate into a legal and financial argument, and legal and financial arguments are the terrain on which Iran has consistently outperformed the United States over the past 46 years. On the other, it rescues Tehran from the trap of looking like the party that closed the strait. By naming a price and a mechanism, Iran transforms the closure from an act of aggression into a conditional state that the United States can choose to end at any time, simply by paying.

Markets should expect this framework to harden into a proposal that Gulf states, European buyers, and Asian importers can engage with even if Washington cannot. Once Tehran publishes fee schedules, the diplomatic center of gravity shifts from the White House to Tehran, because the people who need the oil to flow will negotiate with the people who control the flow. That is a market structure change, not a news cycle.

What The Post Tells The Market

Now go back to the Truth Social sentence. “Open the Fuckin’ Strait, you crazy bastards, or you’ll be living in Hell.”

Strip the profanity and the threat posture and look at what the sentence does logically. It places the burden of reopening on Iran. It implies that Iran closed the strait. It treats the closure as an Iranian act of aggression that must be reversed under threat of escalation. None of that is true. The strait is closed because the United States started a war that financially and physically made transit impossible. Demanding that Iran fix it is like punching a hole in a dam and then screaming at the river for flooding.

That matters for your portfolio for one specific reason. The post is not a negotiation. It is a confession that the architect of the war does not have a mechanism to end it. If Trump had an exit strategy, he would be executing it. If he had a diplomatic channel, he would be using it. If he had a military solution that reopened the strait, he would already be calling it a victory. Instead, he is publicly demanding that the country he is bombing solve his problem for him, and threatening more bombing if it refuses. Iran’s response tells you that Tehran sees exactly the same thing, and has decided to monetize it.

Markets price the end of wars. The problem is that this war, by Trump’s own Truth Social post, has no end condition that he can articulate, let alone deliver. The “quick war thesis” that supported every oil hedge written in early March is now being repudiated by the person who started the war, and the counterparty is publishing a transit-fee framework that only makes sense if the closure extends for months. That is the unpriced variable the $140 Brent print does not yet fully reflect.

The Carter Doctrine was built on a premise that the United States would use its military power to keep the flow going. The premise held for forty-six years because every American president understood that the doctrine’s logic ran in only one direction. You do not enforce freedom of navigation by shutting the navigation down. You do not keep oil cheap by bombing the chokepoint. And you do not resolve a crisis you created by demanding the victim of your war fix it for you.

The Bottom Line

The Truth Social post is not an outburst. It is a document. It is the clearest available record of the moment the Carter Doctrine collapsed under its own inverted weight, spoken aloud by the man inverting it. On February 27, 2026, the Strait of Hormuz was open. On April 5, 2026, the President of the United States is demanding in writing that Iran reopen it, while Iran is publishing the fee schedule he will have to pay to make that happen. Iran retaliated; yes. London underwrote the closure into permanence; yes. But Trump pulled the trigger first, and the trigger was the one that shut the water down.

For forty-six years, every president kept the strait open. You are now living through the presidency that closed it, and you are watching that president demand, in real time, that someone else bear the political cost of reversing what he did. That is not a strategy. That is a man out of road. And oil markets, insurance markets, and European diesel markets are going to spend the next several quarters pricing what happens when the Carter Doctrine eats itself while Tehran hands out toll tickets.

Tuesday, per the post, is Power Plant Day. Keep your eye on Brent at the open.