Shadow Tankers Cross Unchecked

Somewhere off the Bulgarian and Romanian coasts, tankers linked to Russia's shadow fleet are still moving through EU waters. They enter, transit, and leave. Between January and August 2026, at least 14 such vessels spent a combined 418 hours in the waters of two EU member states, according to a Greenpeace Bulgaria investigation based on Lloyd's List Intelligence tracking data (Greenpeace Bulgaria, Fakti). None was stopped. None was boarded. None was detained.

For Malta, a country that has built part of its economy around maritime services and knows the difference between a flag, an owner, an insurer and an operator, the question is not simply why the ships were allowed through. It is what legal lever Bulgaria and Romania actually had in their hands.

Why presence alone can't justify detention

The 14 vessels appear on Lloyd's List's shadow-fleet database, which identifies tankers suspected of deceptive practices linked to sanctioned oil cargoes (Greenpeace Bulgaria). But the published material does not give vessel-by-vessel tracks, cargo histories, insurance details, or evidence that any of the 14 entered port, transferred cargo, or caused pollution in Bulgarian or Romanian waters.

That matters because international maritime law protects innocent passage: under the UN Convention on the Law of the Sea, ships may pass through another country's territorial sea without interference if they are not threatening that state or breaching specific rules (UNCLOS). A sanctions listing does not automatically cancel that right. A tanker crossing the Black Sea without stopping or moving cargo has, legally, the same passage claim as any other vessel. As SWP Berlin has put it, listing a ship creates political pressure, but not a general power to seize it (SWP Berlin).

Greenpeace's campaign has focused public attention on the Kairos, an abandoned sanctioned tanker near Burgas. Activists painted its hull after satellite images showed slick-like traces nearby (Greenpeace Bulgaria Kairos, Cherno More). Bulgarian maritime authorities later said their checks found no active pollution. That factual dispute remains unresolved.

Where enforcement works and where it doesn't

Romania's response shows the weak point. The Romanian Naval Authority said no sanctioned vessel had entered Romanian ports after being listed (DottoTV, Radio Constanta). That answers the port question. It does not answer what passes through Romania's exclusive economic zone, the wider maritime area where a state has rights over resources and pollution control, but not the full authority it has in territorial waters.

ProTV reported that Romania's Coast Guard received more than 1,200 ship-to-ship transfer notifications since May 2022. The Coast Guard said inspections were not needed because the ships had notified under pollution-prevention rules (Stirile ProTV). Notification was being treated as compliance.

Denmark shows where enforcement has teeth when a state uses powers available at ports, anchorages and chokepoints. Sitting on the Baltic route, Copenhagen recorded 292 journeys by shadow-fleet tankers through Danish waters in 2025 (gCaptain). Danish authorities inspected 79 tankers at the Skagen Red anchorage and detained four (Sofart). Denmark also introduced insurance-certificate checks for loaded tankers leaving the Great Belt, feeding missing documentation into sanctions work (Folketinget). The lesson is practical: enforcement works where ships slow down, anchor, seek services or need paperwork. In open water, they pass.

The service levers that could make sanctions bite

The more sensitive bottleneck is not only on the Black Sea. It sits in Athens and, uncomfortably for Malta, in the wider European maritime services economy. Greek-linked operators earned at least $3.8 billion over three years from Russian crude trade, according to Financial Times analysis (Fortune Greece). When the EU's 21st sanctions package tried to restrict maritime services such as insurance, brokering, ship management and finance, Greece blocked the deal until it secured carve-outs for Russian LNG transport (Naftemporiki, News247). EU sanctions need unanimity in the Council, where all 27 member states must agree. Greece used the veto power built into the system.

The EU has kept adding ships to its sanctions lists. The 21st package also gave member states new authority to confiscate cargo from detained shadow-fleet vessels (Skuld, Gard). But cutting off European maritime services has a cost. Cargoes may move onto older ships, under opaque flags and with non-Western insurers, making the fleet harder to track and less safely insured (Brookings).

The 14 tankers and their 418 hours show a sanctions system whose rules are written in Brussels but whose risks wash up on specific coastlines. Bulgaria and Romania carry the environmental exposure from ageing, under-insured ships moving through their waters. Greece controls some of the service levers that could squeeze the trade. Malta should recognise the pattern: in shipping, the real power often lies less in the headline ban than in insurance, management, finance, port access and documentation. Surveillance is not enforcement. Until Sofia and Bucharest use the tools Denmark has shown can work, from anchorage inspections to insurance checks and pollution-triggered interventions, they will keep counting hours while the tankers keep moving.