EU Navy Boards Sanctioned Shadow Fleet Tanker Toa Payoh

Another Flag-Verification Boarding in the Mediterranean

European naval forces have carried out another inspection of a sanctioned tanker tied to Russia’s so-called shadow fleet, continuing a pattern of enforcement action that has picked up pace through 2026. According to a report by gCaptain, Operation EUNAVFOR MED IRINI’s flagship, the Italian Navy vessel ITS Thaon di Revel, boarded the tanker Toa Payoh on August 2 in international waters west of Pantelleria.

The Toa Payoh, which is under EU sanctions, was flying the flag of Cameroon after leaving Cotonou, Benin on July 16, bound for Istanbul. The purpose of the boarding was to check whether the vessel had genuine authorization to fly that flag. The mission reported that the ship’s master was initially uncooperative, prompting Italian naval personnel to be flown in by helicopter to carry out the inspection directly. Backed by a Greek naval unit and a Polish maritime patrol aircraft, the operation took roughly two hours and ended peacefully.

Legal Basis and Official Reaction

The boarding relied on Article 110 of the UN Convention on the Law of the Sea, which permits warships to check a merchant vessel’s nationality on the high seas when there is reasonable suspicion of a false or absent flag. Italy’s Defense Minister, Guido Crosetto, commended the crew involved, calling the action proof of Italy’s role in Mediterranean security and the EU’s wider sanctions push. Operation IRINI said the paperwork and data gathered from the tanker are now under review.

Part of a Widening Campaign

This is not an isolated incident. Just weeks earlier, Operation IRINI intercepted the tanker South Star under similar circumstances after EU officials raised doubts about its registered nationality. IRINI, which was originally set up to police the UN arms embargo on Libya, was given the go-ahead in March to perform these flag checks under UNCLOS Article 110. Its first such boarding took place in May, and by the end of June the mission had already stopped several tankers suspected of shadow fleet activity.

EU foreign policy chief Kaja Kallas has framed the initiative as an effort to back up sanctions with real enforcement on the water. The bloc has also given its Indian Ocean anti-piracy mission, Operation ATALANTA, similar authority to perform flag verifications, pushing the crackdown well beyond European waters.

Why the Shadow Fleet Keeps Growing

Western governments allege that Russia’s shadow fleet depends on murky ownership, frequent flag-hopping, falsified tracking data, and uncertain insurance coverage to keep exporting oil despite sanctions and the G7 price cap. EU officials have separately flagged that many of these older vessels present rising safety and pollution risks.

What It Means for Owners and Charterers

For legitimate ship operators, this pattern of boardings is a reminder that flag-state legitimacy and vessel documentation are now under far more active scrutiny than in previous years. Charterers and financiers dealing with older tankers moving through the Mediterranean, Aegean, or Indian Ocean should expect flag and ownership records to face closer examination, particularly where a vessel has recently changed registry or ownership structure. Independent condition and documentation surveys become more valuable in this environment, not just for insurance and class purposes but as a way to demonstrate a vessel’s paper trail is clean before it draws unwanted naval attention. As EU missions extend flag-verification powers from the Mediterranean into the Indian Ocean, the operational risk of being mistaken for, or genuinely operating within, the shadow fleet is no longer confined to a single region — it is becoming a standing compliance issue for any older tanker with an opaque history.

Reviewed by Ibrahim Halil Ceylan, Marine Surveyor at Apeks Marine.