Trump’s blockade ushers in dangerous new phase of Iran war
American forces began their blockade of Iranian ports on Monday, even as allies scrambled to understand how it will work — and how the Trump administration will avoid sparking new showdowns with the move.
More than a dozen U.S. warships in the region are available to take part, according to one U.S. official, including the USS Tripoli, which has an embarked Marine unit aboard trained to interdict and board ships.
Additional details remain scarce — including how long the blockade will last and what its precise strategic goals are. But President Donald Trump said it will bar ships that have left or plan to enter Iranian ports, as well as any ships that paid Iranian tolls for safe passage.
The maneuver threatens to kick off a dangerous new phase of the war that could see U.S. troops executing high-risk boarding operations of foreign ships in the busy Persian Gulf. And it raises the possibility of wider global conflicts if the U.S. moves to stop foreign-flagged vessels, such as those from China or Russia.
Some officials questioned how U.S. military commanders will actually enforce the blockade, “especially if Iran decides to let more ships through — and not necessarily those that have paid tolls — to overwhelm the blockade,” said one foreign diplomat from a nation with economic interests in the Middle East.
“Is the U.S. Navy going to interdict every one of them, and do they have enough assets for this? And how would they verify who has allegedly paid tolls?” added the diplomat, who, like others in this story, was granted anonymity to discuss sensitive issues.
At stake is the Strait of Hormuz, a vital gateway for the energy sector that Iran has effectively taken control of, causing oil prices to surge and driving up costs across the global economy. The White House appears to be betting that Tehran will capitulate and open the strait if the U.S. can cut off Iran’s ability to export its own oil via tankers.
But the passage is vital to nations well beyond Iran, including China and Japan, which import oil from ships that traverse the strait. And some countries — such as Russia — use “shadow fleet” vessels that are controlled by Moscow or Tehran, even though they are flagged under third-party nations.
While the U.S. might seize “shadow fleet” vessels, doing the same with a commercial ship hailing from China, for example, could touch off an international incident.
“If it’s a flagged ship from India or a flagged ship from China that chooses to go run the blockade, or they bring a warship as an escort to protect them, now we’re into a different scenario,” said John Miller, a retired three-star admiral who previously commanded American ships in U.S. Central Command. “And it remains to be seen whether we would want to force that blockade against a Chinese-flagged vessel, for example, or not.” [Continue reading…]
As Donald Trump threatened a naval blockade on Iran, Tehran hit back with an unusual warning—this time using mathematics to make its point on rising fuel prices.
Iran’s Parliament Speaker Mohammad Bagher Ghalibaf cautioned that global consumers would soon feel the pain, posting online: “Enjoy the current pump figures. With the so-called ‘blockade’, soon you’ll be nostalgic for $4–$5 gas.”
Alongside the remark was a cryptic equation suggesting that any escalation in a blockade of the Strait of Hormuz could trigger a nonlinear spike in oil prices—meaning prices wouldn’t just rise, but accelerate sharply.
ΔO_BSOH>0 ⇒ f(f(O))>f(O) — What does the equation mean?
At its core, the equation argues that even a small increase (ΔO > 0) in Blockade of Strait of Hormuz (BSOH) can lead to compounding effects on oil prices.
The first impact (f(O)) is the immediate price rise due to supply disruption.
The second (f(f(O)) ) reflects knock-on effects—panic buying, supply chain shocks, insurance spikes, and market speculation
In simple terms, if tensions worsen, oil prices won’t just go up—they could surge disproportionately, making today’s high prices look mild in comparison. [Continue reading…]
ΔO_BSOH>0 ⇒ f(f(O))>f(O) is worth understanding.
Ghalibaf is mathematically making the point that the oil prices will be much worse as a result of BSOH = Blockade Strait of Hormuz. There the first order effect f(O), and possibly a significant second order effect, f(f(O)).
— Javed Hassan (@javedhassan) April 13, 2026