Maritime monitoring service TankerTrackers.com said on Thursday that a ship which Iranian media reported had run aground in the Strait of Hormuz has in fact been stuck in the same spot since March and is part of an operation managed by the notorious Iranian oil magnate Mohammad Hossein Shamkhani.

Here is what we know about Shamkhani, whom the US and EU allege is a central figure in Iranian and Russian shadow fleet operations, generating billions of dollars of oil revenues for both, and what happened to his ship in the Hormuz strait.

What do we know about the stranded ship?

On Thursday, TankerTrackers.com reported that the ship that Iranian media said had run aground in the Strait of Hormuz after using a “US-suggested route” has actually been stuck in the same spot since March.

It identified the vessel as the Arista, and reported that while it is Comoros-flagged, it is in fact part of an operation managed by the sanctioned Iranian oil magnate Shamkhani.

Who is Mohammad Hossein Shamkhani and what are the allegations against him?

Shamkhani is an Iranian oil shipping magnate who has multiple Western sanctions imposed on him. He is the son of the late Ali Shamkhani, a senior political adviser to Iran’s former Supreme Leader Ayatollah Ali Khamenei.

Ali Shamkhani led the Supreme National Security Council (SNSC) for a decade until 2023, making him the second-longest-serving security chief since 1979 after former President Hassan Rouhani, who was SNSC secretary for nearly 16 years.

He was reportedly killed in the first Israeli-US strikes on Tehran on February 28 , which triggered the war with Iran and also killed Khamenei, whose funeral begins tomorrow.

In March, the Sarajevo-based Organised Crime and Corruption Reporting Project (OCCRP) reported that following an investigation, Mohammad Hossein Shamkhani and his brother had used aliases and Caribbean “golden passports” to amass a $29m million property portfolio in Dubai.

The US Treasury, which has sanctioned the Shamkhani shipping empire, says it is part of a massive Iranian and Russian oil smuggling ring and that the Comoros‑flagged Arista aground in Hormuz is part of that network.

How does Shamkhani’s oil shipping operation work?

According to the US Treasury, the Shamkhani network makes use of “front” companies to buy Iranian and Russian oil for which it falsifies shipping documents. It switches the oil between vessels frequently via its shipping operations and sells the oil on to buyers who pay for it via their own front companies to obscure the flow of money.

Additional profits are funnelled through hedge funds and other money-laundering operations, the US Treasury alleges.

It said Shamkhani relies on a mix of crude oil, oil product and liquefied petroleum gas (LPG) tankers to generate billions of dollars for the Iranian and Russian regimes.

According to the European Commission, Shamkhani “uses the company Milavous Group Ltd to blend crude oil with various petroleum products from Russia and to rebrand for exporting purposes, thereby concealing their origin”.

Shamkhani is not known to have responded publicly to these allegations.

What sanctions have been imposed on Shamkhani?

Shamkhani was first sanctioned by the US last July, amid a large number of Iran-related sanctions. In April, the US Treasury Department announced additional sanctions on Shamkhani’s network.

“Treasury is moving aggressively with Economic Fury by targeting regime elites like the Shamkhani family that attempt to profit at the expense of the Iranian people,” Treasury Secretary Scott Bessent said.

A statement from the US Treasury added that Shamkhani “heads a multi-billion dollar Iranian and Russian petroleum sales empire that enriches a family connected to the highest echelons of the Iranian regime at the expense of the Iranian people”.

The European Union sanctions tracker website says Shamkhani is also subject to EU sanctions, describing him as “a businessperson active in the Russian oil trade and a central player in Russia’s so-called ‘shadow fleet’.”

Russia’s shadow fleet is a network of hundreds of ageing, poorly regulated oil tankers that Russia uses to export crude and fuel while evading Western sanctions imposed after its invasion of Ukraine in 2022.

An August last year, the UK government also announced sanctions against Shamkhani including an asset freeze, director disqualification and travel ban. Minister for the Middle East Hamish Falconer said: “The UK is announcing sanctions against those who operate on behalf of Iran, fuelling its attempts to undermine stability in the Middle East and global security.

“Iran’s reliance on revenues from trading networks and connected organisations enables it to carry out its destabilising activities, including supporting proxies and partners across the region and facilitating state threats on UK soil.”