The Ministry of Defence announced that UK Armed Forces boarded the sanctioned Russian shadow fleet tanker SMYRTOS in the Channel on 14 June 2026, in an operation involving Royal Marines and National Crime Agency officers that lasted six hours.
The operation took place in international waters in the early hours of the morning. The vessel is now due to be moved provisionally to an anchorage off the South Coast of England.
The government said the action was carried out under domestic and international law. It follows a March decision by the Prime Minister allowing British Armed Forces and law enforcement officers to board shadow fleet vessels where lawful grounds exist.
UK Forces Board Sanctioned Tanker
The Ministry of Defence said the sanctioned oil tanker SMYRTOS was boarded as part of the first UK-led operation of its kind. The vessel is linked by the government to Russia’s shadow fleet, which is used to move sanctioned oil.
Royal Marine Commandos and specially trained National Crime Agency officers took part in the boarding. The government said the action was intended to disrupt Russia’s sanctions evasion and reduce resources available to support the war in Ukraine.
- Vessel: SMYRTOS, a sanctioned oil tanker identified by the government as part of Russia’s shadow fleet.
- Location: International waters in the Channel, with the vessel to be held off the South Coast of England.
- Duration: The military operation lasted six hours, according to the Ministry of Defence.
Operation Involved Royal Marines And Law Enforcement
The boarding was carried out by Royal Marine Commandos alongside National Crime Agency officers. The operation was supported by aircraft from the Maritime Air Group, including Chinooks, Merlin Mk4 and Wildcat aircraft.
An RAF P-8 aircraft also supported the operation, alongside HMS SUTHERLAND and HMS LEDBURY. The government said the enforcement action was carried out in accordance with domestic and international law.
Operation Support Assets
| Indicator | Recent Movement | Context |
|---|---|---|
| Royal Marines | Boarded SMYRTOS | The Ministry of Defence said Royal Marine Commandos took part in the operation. |
| National Crime Agency | Provided law enforcement officers | The government said specially trained officers boarded the vessel with military personnel. |
| Military support | Aircraft and ships deployed | RAF, Royal Navy and Maritime Air Group capabilities supported the six-hour operation. |
Vessel To Be Held Off South Coast
SMYRTOS will be moved provisionally to an anchorage off the South Coast of England. The government said the vessel will be monitored while investigations continue.
Officials also said monitoring will cover environmental and safety concerns. No further operational outcome was announced in the release beyond the planned holding and investigation process.
UK Links Action To Russia Sanctions Enforcement
The government said Russia uses a large shadow fleet network to transport sanctioned oil and generate revenue for its war effort in Ukraine. UK sanctions have increasingly targeted vessels linked to these operations as part of wider efforts to restrict Russian energy exports.
Government background information said hundreds of shadow fleet vessels have now been sanctioned and that Russian oil and gas revenues declined during 2025. Ministers described the boarding of SMYRTOS as part of a broader strategy to increase enforcement pressure on sanctions evasion networks.
- Sanctions focus: The action forms part of UK efforts to enforce measures against vessels linked to Russian oil movements.
- Revenue pressure: The government said Russia’s oil revenues are down 27% compared with October 2024.
- Fleet risk: Background material said more than 72% of shadow tankers are over 15 years old.
Russian Shadow Fleet Indicators
| Indicator | Recent Movement | Context |
|---|---|---|
| Sanctioned vessels | Almost 600 | Government background material said the UK has sanctioned almost 600 Russian shadow fleet vessels. |
| Oil and gas revenues | Down 24% | The release said Russia’s oil and gas revenues fell by 24% year-on-year in 2025. |
| Sanctioned oil carried | 75% | The government said the shadow fleet is responsible for carrying 75% of Russia’s sanctioned oil. |
Wider International Coordination
The Ministry of Defence said the operation was coordinated with France and follows wider cooperation with allies targeting shadow fleet activity. Officials described the boarding as part of a broader international effort to disrupt sanctions evasion and reduce revenue flowing to Russia’s war economy.
The government said the SMYRTOS operation was conducted in close coordination with France. It framed the action as part of wider partner efforts to reduce resources sustaining Russia’s aggression in Ukraine.
Ministerial Comments
Prime Minister Keir Starmer said;
“This operation delivers yet another blow to Russia and reminds those fueling Putin’s war in Ukraine that they cannot hide.”
“I want to pay tribute to all those involved, including our Armed Forces and law enforcement officers who keep this country safe 24 hours a day, 365 days a year.”
Defence Secretary Dan Jarvis said;
“Operations like this require skill, professionalism and courage. I pay tribute to our Armed Forces personnel and all those involved.”
“Russia relies on its shadow fleet to fund their conflict in Ukraine and our interdiction delivers a blow to Putin’s illegal war.”
UK Shadow Fleet Sanctions Context
The release said sanctioned ships carried $1.6 billion less in Russian oil in the first quarter of 2025 than a year earlier. Background material also said there have been more than 50 incidents involving Russia’s shadow fleet.
The government cited legal routes connected to maritime enforcement and sanctions powers. It said today’s action sends a message that the UK will use available legal tools to enforce sanctions and protect security.
The boarding of SMYRTOS marks the first UK-led operation of its kind against a Russian shadow fleet vessel. The Ministry of Defence linked the action to sanctions enforcement, maritime security and efforts to reduce revenues supporting Russia’s war in Ukraine. The vessel will now be held off the South Coast while investigations and monitoring continue.
Sources: Ministry of Defence, Dan Jarvis MBE MP and The Rt Hon Sir Keir Starmer KCB KC MP.
Prepared by Ivan Alexander Golden, Founder of THX News, an independent news organisation delivering timely insights from global official sources. Combines AI-analysed research with human-edited accuracy and context.
