UK Prepares to Board Russian ‘Shadow Fleet’ Ships in Its Waters

The United Kingdom is preparing to board and detain ships linked to Russia’s so-called shadow fleet as part of a tougher enforcement campaign against sanctions on Moscow’s oil exports.

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Officials say Prime Minister Keir Starmer has approved military action against vessels suspected of transporting sanctioned Russian oil through British waters. The first operation could take place soon after specialised training exercises concluded in recent weeks.

Military Action Planned

The shadow fleet refers to a network of ageing tankers and other vessels used to move oil while bypassing Western sanctions imposed after Russia’s invasion of Ukraine. Many ships operate under unclear ownership structures or without recognised national flags to evade oversight and enforcement.

British authorities believe such shipments generate revenue that supports the war effort of Russian President Vladimir Putin.

Starmer said the move aims to “starve Putin’s war machine” of oil profits used to finance the conflict in Ukraine.

Training and Operational Plans

Specialised British military units have been preparing for potential boarding operations, including scenarios involving resistance from ship crews.

Personnel from the Royal Navy, the Royal Marines and the Special Boat Service could take part, depending on the level of risk expected during an operation.

Government officials say the preparations included simulated exercises to test how forces would handle a range of situations, including the possibility that crews aboard the targeted vessels might be armed.

Although British forces have not yet boarded any ships linked to the shadow fleet, authorities say operational planning has reached an advanced stage.

The government has already sanctioned hundreds of vessels suspected of involvement in sanction-busting oil shipments.

Legal Framework and Monitoring

Ministers identified the Sanctions and Money Laundering Act 2018 as the legal basis that could allow British forces to board and detain sanctioned vessels inside UK territorial waters.

Officials say about three-quarters of Russia’s crude oil exports are now transported on ageing tankers believed to be part of the shadow fleet.

Military planners are using ship-tracking systems to monitor movements of sanctioned vessels approaching British waters, enabling authorities to identify possible targets weeks before they arrive.

Despite the legal authority identified earlier this year, analysis suggested dozens of sanctioned ships still passed through the English Channel in the weeks that followed.

Part of Wider Pressure on Russia

The plan forms part of a broader Western effort to limit Russia’s oil income and restrict the resources available for the war in Ukraine.

Britain has worked with several northern European partners to monitor shadow-fleet activity at sea, including through the Joint Expeditionary Force.

Starmer is expected to discuss further action against the fleet at a summit of the alliance in Helsinki.

British naval forces have already supported monitoring efforts alongside allies such as Finland, Sweden and Estonia in recent weeks.

Officials say disrupting the shadow fleet has become a priority because the vessels continue to move large volumes of Russian oil despite sanctions designed to curb Moscow’s revenues from energy exports.

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Adapted by ASEAN Now. Source 26 March 2026

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