Iran's Touska Was Carrying Missile Chemicals. Now the US Navy Has Seized a Second Ship in the Bay of Bengal

It began with a hole blown in an engine room in the Gulf of Oman. It ended — for now — with a second ship boarded without a shot fired in the Bay of Bengal, thousands of miles away, two days later.

In 48 hours, the United States Navy served notice to every ship captain, every sanctions-evading oil trader, and every government quietly supplying Iran with the materials it needs to keep fighting: international waters are no longer a refuge. The blockade is not a line drawn around the Strait of Hormuz. It is a global maritime hunt. And it has only just begun.

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What Was on the Touska

On April 19, 2026, the USS Spruance — an Arleigh Burke-class guided-missile destroyer — intercepted the Iranian-flagged cargo vessel Touska in the Gulf of Oman. The ship was warned for six hours. Its crew ignored every warning. The Spruance then fired several rounds from its 5-inch Mark 45 gun directly into the Touska's engine room, disabling its propulsion. US Marines from the 31st Marine Expeditionary Unit rappelled from helicopters onto the deck and took full custody of the vessel.

President Trump announced the seizure on Truth Social, writing that US forces were "seeing what's on board."

What they found was the story.

The Touska had loaded its cargo at Gaolan port in Zhuhai, China — a port that the Washington Post has specifically identified as a documented loading point for sodium perchlorate shipments headed to Iran. Sodium perchlorate is not a generic industrial chemical. It is the primary oxidiser precursor used in the production of ammonium perchlorate — the solid propellant that powers Iranian ballistic missiles including the Shahab-3 and Fateh-110 series. Alongside the sodium perchlorate, US Marines found metals, pipes, and electronic components — a mixed manifest that provided civilian cover for the most sensitive item in the hold.

The Touska's route told its own story. After loading in Zhuhai, the ship went dark — turning off its AIS transponder, the maritime equivalent of switching off a phone's location tracking — for two and a half days. It then made a port call in Port Klang, Malaysia, a well-documented transshipment hub where Iranian-linked vessels routinely stop to re-manifest cargo, obscuring its true origin and destination. It departed Port Klang on April 12. On April 19, it tried to run the US blockade.

Ray Powell, director of maritime transparency initiative SeaLight, put the significance of that decision bluntly: a ship attempting to transit through an active US naval blockade "would seem to indicate that there was something aboard that ship that they really perhaps needed in Iran." You don't run a blockade for a routine cargo.

Former US Ambassador to the United Nations Nikki Haley said what the Pentagon had not yet officially confirmed, posting on X: "The ship the US seized in the Strait of Hormuz this weekend was headed from China to Iran and is linked to chemical shipments for missiles. Another reminder that China is helping prop up Iran's regime — a reality that can't be ignored."

China, for its part, maintained its standard position — that it does not sell arms to Iran and enforces strict controls on dual-use goods. What China does not enforce are US sanctions, which Beijing considers unilateral and illegal.

The Touska is now a prize of war. Under the laws of naval warfare, a vessel caught running a blockade can be seized and potentially become the property of the seizing government. A prize court would need to be established to formalise that outcome. In the meantime, the ship sits in US custody — disabled, inspected, and emblematic of a supply chain that the United States has now formally decided to disrupt at sea.

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48 Hours Later: The Bay of Bengal

If the Touska seizure was a statement, the boarding of the MT Tifani was a doctrine.

On April 21 — just 48 hours after the Touska was seized — the Pentagon announced that US forces had conducted a "right-of-visit maritime interdiction" of the MT Tifani in the Bay of Bengal, between India and Southeast Asia. The operation was carried out without incident. No shots fired. No resistance.

The Tifani is an oil tanker. According to energy intelligence firm Kpler, it loaded approximately 2 million barrels of crude oil at Iran's Kharg Island on April 5 and passed through the Strait of Hormuz on April 9 — four days before the US blockade was formally announced. It had been making its way east through Asian waters, likely headed toward China, when US forces intercepted it.

The Pentagon described the Tifani as "stateless" — a legally significant designation. The ship was flying a Botswana flag. By declaring it stateless, the US removed the protection that a national flag theoretically provides under international maritime law, clearing the legal path for boarding without the flag state's consent.

The message from the Pentagon was unmistakable: "International waters are not a refuge for sanctioned vessels. As we have made clear, we will pursue global maritime enforcement efforts to disrupt illicit networks and interdict sanctioned vessels providing material support to Iran — anywhere they operate."

Anywhere they operate.

General Dan Caine, Chairman of the Joint Chiefs of Staff, had already signalled this expansion the previous week, telling reporters that enforcement actions would extend beyond Iranian waters and that US forces in all areas of responsibility "will actively pursue any Iranian-flagged vessel or any vessel attempting to provide material support to Iran." He specifically pointed to operations in the Pacific.

The Bay of Bengal boarding was not a coincidence. It was the first proof of concept.

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The Ceasefire Nobody Actually Signed

Here is the legal and diplomatic problem sitting at the centre of all of this, and it is a significant one.

The US and Iran reached a ceasefire earlier this month. Trump announced it. Iran acknowledged it. And then the US continued its naval blockade, seized the Touska, and boarded the Tifani — all while insisting the ceasefire remained intact.

Iran's position is straightforward: the ceasefire was a pause on all hostile acts. Seizing a commercial vessel and taking its crew into custody is a hostile act. Iranian Foreign Minister Abbas Araghchi said "striking a commercial vessel and taking its crew hostage is an even greater violation" of the ceasefire, and Tehran has called both seizures "piracy at sea and state terrorism."

The US position is equally straightforward but legally more complicated. Washington takes the view that the conflict never fully switched off — that a state of armed conflict continues to exist, and that enforcing a naval blockade and using limited force at sea are legitimate acts of war that the ceasefire did not prohibit. The US agreed to stop dropping bombs on Iran. The blockade, in Washington's reading, was never covered.

The problem, as legal experts and analysts have noted with increasing urgency, is that none of this was written down. "Trump announced it. The Iranians agreed. But there's no formal agreement," said Mark Cancian of the Center for Strategic and International Studies. "Nothing was written down. So whether it broke the ceasefire or not depends on your perspective."

Iran has threatened retaliation. It launched attack drones at US ships after the Touska seizure, though no damage was reported. It has said its forces "will soon respond" to what it calls armed piracy. And crucially, it has used both seizures as justification for refusing to send negotiators to the second round of peace talks in Islamabad — talks that the US needs to happen if a diplomatic resolution is to be reached before the ceasefire expires.

The blockade is working economically. Trump claims it is costing Iran $500 million a day. But it is simultaneously strangling the diplomatic track that could end the war. That tension — between maximum economic pressure and the conditions needed for negotiation — is the central unresolved contradiction of US Iran policy right now.

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The Ghost Fleet Is Still Running

While the US was seizing the Touska and boarding the Tifani, Iran's shadow fleet was not standing still.

Lloyd's List Intelligence reported that at least 26 ships from Iran's ghost fleet had successfully circumvented the US blockade since it was imposed on April 13 — slipping through in both directions, both entering and departing Iranian ports. Eleven tankers carrying Iranian cargo managed to exit the Gulf of Oman during the brief window when Iran claimed to have reopened the Strait.

Iran's shadow fleet is vast, experienced, and specifically designed to evade exactly this kind of enforcement. It has been operating under US and European sanctions for years. It knows how to go dark, how to conduct ship-to-ship transfers in poorly monitored waters, how to re-flag and re-manifest cargo through intermediary ports in Malaysia, the UAE, and elsewhere. The Touska and Tifani were caught. Twenty-six others were not.

The US is playing a game of maritime whack-a-mole against an opponent that has spent a decade learning the rules of sanctions evasion. Every ship seized sends a message. Every ship that slips through quietly undermines it.

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What Beijing Has to Answer For

The Touska cargo puts China in an uncomfortable position that no amount of diplomatic language will easily resolve.

The ship loaded at Gaolan port in Zhuhai. Gaolan is not a mystery location — it is documented in open-source intelligence as a key node in Iran's missile propellant supply chain. Sister ships under the same IRISL subsidiary carried 1,000 tons of missile solid propellant materials from China last year. Two other affiliated ships traveled the same Zhuhai-to-Iran route in March. The pattern is not ambiguous.

China's official position is that it does not sell arms to Iran and maintains strict controls on dual-use goods. What that position cannot explain is why a documented missile fuel precursor keeps appearing in Chinese ports, on Chinese-routed vessels, heading to Iran, repeatedly, across multiple voyages and multiple ships — while the war in the Middle East continues and Iran's ballistic missile inventory remains a central concern for the entire region.

The Touska seizure has handed Washington a concrete, physical, inspectable piece of evidence linking Chinese port infrastructure to Iranian missile production. How the Trump administration chooses to use that evidence — in bilateral trade talks, in sanctions enforcement, or as leverage in a broader geopolitical negotiation — will be one of the more consequential decisions of the coming weeks.

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The New Rules of the Sea

What the Touska and Tifani seizures represent, taken together, is a fundamental shift in how the United States intends to enforce its Iran policy.

The blockade of the Strait of Hormuz was always going to be contested, temporary, and geographically limited. The global maritime hunt is something different. It extends US enforcement reach to the Bay of Bengal, to the waters off Malaysia, to the Pacific — anywhere a sanctioned vessel or a vessel carrying material support for Iran can be found.

"International waters are not a refuge for sanctioned vessels." That line from the Pentagon is not rhetoric. It is a policy declaration with teeth — backed by Arleigh Burke destroyers, Marine expeditionary units, P-8 Poseidon patrol aircraft, and the intelligence infrastructure to track vessels that go dark, re-flag, and re-route through the world's most opaque shipping lanes.

For Iran, the implications are severe. Its ability to export oil — the financial lifeline that funds the war — is under direct assault not just at the Strait of Hormuz but across every ocean its tankers attempt to cross.

For China, the implications are diplomatic and legal. Its ports, its shipping companies, and its cargo are now subject to scrutiny and seizure in a way that has no recent precedent.

For the rest of the world, watching a ceasefire that was never written down fray in real time across two oceans simultaneously, the implications are the most unsettling of all.

The Touska was the first shot. The Tifani was the doctrine.

The hunt is global now.

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Sociolatte covers geopolitics and global affairs. Published April 22, 2026.