The United Kingdom has taken a significant step in its efforts to disrupt Russia’s evasion of international sanctions. In a bold operation, British forces intercepted and seized a sanctioned Russian oil tanker in the English Channel. This operation, led by Royal Marine commandos, marks a crucial move in the ongoing efforts to curb Russia’s ability to fund its war in Ukraine.
The intercepted vessel, named the Smyrtoswas sailing under a Cameroonian flag and had departed from the Russian Baltic port of Ust-Luga on June 5, destined for Port Said, Egypt. The operation, which lasted six hours, was conducted in close coordination with French authorities and involved a variety of military assets, including helicopters and warships.
The Operation: A Detailed Look
The operation began when the Smyrtos entered the English Channel from the north, passing close to Dover. Just before midnight, the tanker abruptly changed course towards the English coast. In the early hours of Sunday, Royal Marines from 42 Commando boarded the vessel. Footage released by the Ministry of Defence (MoD) shows the commandos fast-roping from a CH-47 Chinook helicopter onto the tanker in darkness.
Further footage shows marines carrying KS-1 rifles searching the ship, and heavily armed commandos and National Crime Agency officers moving through its interior, inspecting documentation and paperwork. By 5:05 am (UTC) on Sunday, the Smyrtos had come to a stop off the coast of Dorsetwhere it is now anchored and being monitored for any environmental or safety concerns.
The Shadow Fleet: A Network of Deception
The shadow fleet is a network of ageing tankers with opaque ownership that Russia uses to export oil and evade Western sanctions imposed after its full-scale invasion of Ukraine in 2026. The MoD estimates that the fleet numbers more than 700 vessels and carries 75% of Russia’s sanctioned oil, generating revenue that funds missiles and drones used against Ukraine.
Each shadow fleet ship is usually owned not by an identifiable firm but by a shell company, a business that exists largely on paper, with no real operations, set up to obscure who ultimately controls the vessel. Shadow fleet operators also often register the vessels in states with light-touch regulation and minimal oversight, known as flags of conveniencewhich makes the ship harder to scrutinise or hold to account.
Once at sea, the tankers use several methods to stay hidden. One is the ship-to-ship transfer, pumping oil from one vessel to another in open water, away from the port authorities who would otherwise log the cargo and its origin. Operators also tamper with the systems that identify and track a ship, such as using fake vessel identification numbers and spoofing location data.
International Cooperation and Future Steps
This seizure is the first the UK has led, after months of supporting interceptions by European allies. French forces boarded the sanctioned tanker Tagor around 400 nautical miles west of Brittany on June 1, with the British warship HMS Somerset and its helicopter tracking the vessel beforehand. The Tagor had left Russia’s northern shores in late May, flying the flag of Madagascar before switching to Cameroon mid-voyage.
Ukrainian President Voldymyr Zelenskyy thanked Prime Minister Keir Starmer and the British people for their principled resolve. He emphasized that every decision by partners that deprives Russia of money also limits the war itself. Zelenskyy called for Europe to take legislative steps to enable not only the detention of tankers and restrictions on oil shipments but also the confiscation of the oil they carry.
The UK’s Ministry of Defence stated that such operations are directly bearing down on the resources sustaining Russia’s aggression in Ukraine and reducing its capacity to threaten security across Europe and beyond. This operation underscores the UK’s commitment to disrupting Russia’s shadow fleet and supporting international efforts to curb the funding of Russia’s war in Ukraine.
