British military personnel and law enforcement officers have boarded a Russian-linked oil tanker in the English Channel in what is being described as the first UK-led operation of its kind against Moscow’s so-called “shadow fleet”.
The vessel, named SMYRTOS, was intercepted in the early hours of Sunday by Royal Marine Commandos and specially trained officers from the National Crime Agency as part of efforts to enforce sanctions imposed on Russia following its invasion of Ukraine.
The operation lasted around six hours and involved significant military support, including aircraft from the Maritime Air Group, RAF surveillance assets, and Royal Navy warships.
According to the Ministry of Defence, the tanker is suspected of being part of Russia’s shadow fleet, a network of vessels used to transport oil and other goods while attempting to evade international sanctions.
Following the boarding, the vessel was ordered to move to an anchorage off the south coast of England, where it will remain under monitoring while investigations continue.
Defence Secretary Dan Jarvis praised the personnel involved in the operation, describing it as a complex mission requiring “skill, professionalism and courage”.
The UK Government said the action was carried out in accordance with both domestic and international law. Officials cited powers available under international maritime law and UK sanctions legislation to justify the intervention.
Russia’s shadow fleet has become a major focus of Western sanctions enforcement. The vessels are often older tankers operating under opaque ownership structures and frequently change flags or registration details in an attempt to avoid restrictions.
Government figures suggest the fleet is responsible for transporting around three-quarters of Russia’s sanctioned oil exports. Revenue from those exports is regarded by Western governments as a key source of funding for Russia’s military operations in Ukraine.
The UK has stepped up efforts to target the network in recent years and says it has now sanctioned almost 600 shadow fleet vessels. Ministers claim these measures are having an impact, with Russian oil and gas revenues falling significantly since 2024.
Officials also pointed to safety concerns surrounding the ageing fleet. More than 70 per cent of shadow fleet tankers are reported to be over 15 years old, and there have been dozens of incidents involving vessels linked to the network.
The operation was conducted in close coordination with France and follows previous British support for allied efforts to intercept and investigate sanctioned vessels operating in European waters.
The interception of the SMYRTOS marks a significant escalation in the UK’s enforcement of sanctions at sea and sends a clear signal that authorities are prepared to take direct action against vessels suspected of helping Russia bypass international restrictions.
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