London184 sanctioned ships passed through UK waters unboarded.
PM Starmer announced in March that armed forces could board sanctioned vessels; since then, 238 passages have gone unchallenged.
The Ministry of Defence cites disruption but has provided no evidence; a former Royal Navy commander called the inaction “pathetic.”
Sources: BBC
WHAT THE SHADOW FLEET IS
A loose network of aging tankers — typically 15-20 years old, near the end of their commercial life — bought up since 2022 to move Russian crude outside the G7 price cap. Ownership hides behind shell companies in Dubai, Hong Kong, and Mumbai; flags shift between Gabon, Cameroon, Panama, and the Cook Islands.
THE PRICE CAP MECHANISM
The G7 cap (initially $60/barrel for Russian crude) doesn't ban Russian oil — it bans Western insurers, shippers, and financiers from servicing cargoes priced above the cap. The shadow fleet exists to operate without that Western service stack: non-Western insurance, non-Western flags, non-Western buyers.
THE INSURANCE GAP
Roughly 90% of global tanker tonnage was traditionally covered by the International Group of P&I Clubs, all Western-based. Shadow tankers carry coverage from Russian state insurers or unknown providers — meaning if one runs aground in the Baltic or English Channel, the coastal state, not the insurer, eats the cleanup bill.
WHY THE CHANNEL MATTERS
Most shadow-fleet voyages from Russia's Baltic ports — Primorsk, Ust-Luga, Novorossiysk via Bosphorus — pass within miles of UK, Danish, and French coastlines. The English Channel is the chokepoint that any Baltic-loaded cargo bound for India or China must transit.
WHERE THE OIL GOES
India and China absorb the bulk of shadow-fleet crude; Turkey takes refined products and re-exports some as 'non-Russian' diesel back to Europe. The cap was never designed to stop the oil moving — only to compress the price Russia receives. On that narrow metric it has partially worked; on volumes it has not.
THE BOARDING QUESTION
Under UNCLOS Article 17, foreign ships enjoy right of innocent passage through territorial waters. Boarding a sanctioned but otherwise law-abiding tanker is legally contested — flag state consent is normally required outside narrow exceptions (piracy, slavery, unflagged vessels). Starmer's March announcement implied the UK would push the envelope; the 238 unchallenged passages suggest the legal advice held it back.