British authorities have detained a sanctioned oil tanker believed to be connected to Russia’s so-called “shadow fleet,” marking what officials described as the first United Kingdom-led operation of its kind. The move reflects continuing efforts by Western countries to enforce sanctions imposed on Moscow following its invasion of Ukraine.
The vessel, identified as the Smyrtos, was intercepted in the English Channel on Sunday in a joint operation involving Royal Marine commandos and British defense authorities. Officials said the tanker will remain under supervision off the southern coast of England while investigations continue.
According to the UK Defence Ministry, Royal Marine commandos boarded the vessel after rappelling from helicopters during the operation. British authorities said the action was coordinated closely with French officials, who have previously intercepted vessels suspected of helping Russia circumvent international restrictions.
Prime Minister Keir Starmer said the operation sends a strong message to those supporting Russia’s military activities in Ukraine.
“This operation delivers another blow to Russia and demonstrates that those helping finance the war cannot escape accountability,” Starmer said.
Western governments have accused Russia of relying on a network of aging and often obscurely registered vessels to transport oil despite sanctions. These ships, commonly referred to as the “shadow fleet,” are believed to help maintain Russian energy exports and provide financial resources for the war effort.
According to shipping data, the Smyrtos, sailing under the flag of Cameroon, departed from the Russian port of Ust-Luga on June 5 and was reportedly heading toward Port Said in Egypt.
Authorities have not yet disclosed additional details about the cargo onboard or possible legal actions that could follow the investigation.
Ukrainian President Volodymyr Zelenskyy welcomed the move and thanked Britain for its continued support.
In a statement, Zelenskyy said reducing Russia’s oil revenues weakens Moscow’s ability to sustain military operations. He also urged European countries to adopt stronger measures, including legislation allowing the confiscation of oil cargoes carried by sanctioned vessels.
Ukraine and its allies have repeatedly argued that limiting Russian energy income remains one of the most effective tools for increasing economic pressure on the Kremlin.
The detention of the tanker highlights growing international efforts to strengthen enforcement mechanisms against sanctions evasion. European governments have become increasingly concerned about the role played by shadow fleets in sustaining Russian exports and creating risks for maritime safety.
Security experts believe similar operations could become more common as Western nations seek to close loopholes used to bypass restrictions.
The investigation into the Smyrtos is expected to continue in the coming days, with British authorities monitoring the vessel while determining its links to sanctioned activities. The operation underscores the broader effort by European allies to disrupt financial channels that support Russia’s military campaign and reinforce maritime security across the region.
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