EU Seeks Port Stops For Russian Tankers

Europe can follow suspected shadow-fleet tankers, name them in sanctions packages and keep them out of ports. What it cannot easily do is hold them. The legal tools that identify a suspect vessel and the legal tools that let a state detain it sit in different boxes, and France and Germany are reportedly trying to join them up.

Why Boarding a Tanker Is Harder Than It Sounds

At sea, the room for manoeuvre is narrow. Under UNCLOS, the UN Convention on the Law of the Sea, a warship can board a foreign vessel only in defined cases, including piracy, slave trading or statelessness. Suspicion that a tanker is carrying Russian oil does not meet that test (UNCLOS Article 110).

Closer to land, coastal states have more authority, though not a free hand. In territorial waters and international straits, foreign ships still have passage rights that cannot simply be waved away (UNCLOS). Denmark controls the Danish Straits, but it cannot close them to transit under the same rules (Danish Maritime Authority).

The real leverage begins in ports. EU law already allows foreign ships to be inspected and detained when serious defects threaten safety or the environment (Directive 2009/16/EC). The EU sanctions regime, now in its 17th package, also names specific vessels and bans maritime services linked to Russian oil.

Britain has shown what these powers can do in practice. In June, British forces intercepted the suspected shadow-fleet tanker Smyrtos and moved it to anchorage for investigation (UK government, BBC). Detention, though, is not confiscation. The Smyrtos was held for checks rather than stripped of its cargo (The Guardian). In earlier cases, tankers were generally released with their oil still on board.

Two Legal Routes, One Political Bottleneck

The workable route runs on two tracks. The sanctions track lists vessels, bans services and demands insurance disclosure. It passes through the EU’s foreign-policy system, where unanimity gives every member state a veto (TEU Article 31).

The transport track offers a different lever. It could turn shadow-fleet warning signs into mandatory inspection triggers, then link missing certificates or insurance gaps to detention. Transport rules usually pass by qualified majority voting, where larger countries carry more weight but no single capital can block the measure alone (TFEU Article 100).

That route only works if the legal basis stays tied to safety: certificates, insurance and seaworthiness. EU law requires proportionality, meaning the restriction must match the problem it claims to address. If the measure drifts into geopolitical suspicion dressed up as maritime safety, it will be vulnerable under UNCLOS and before EU courts.

The Shipping-State Brake

Cyprus is the quiet constraint in the room. It has a large shipping-services industry and treats it as a strategic economic sector (Shipping Deputy Ministry). Nicosia is more likely to demand tight drafting, legal safeguards and limited liability than to block the whole exercise. If the rules are drawn too widely, shipping activity could move outside EU jurisdiction, reducing European oversight without stopping Russian oil flows. The ICIJ’s Cyprus Confidential investigation, which exposed offshore financial networks routed through the island, also leaves Cyprus under reputational pressure not to look soft on sanctions enforcement.

On the Baltic side, Poland casts tougher maritime enforcement as critical-infrastructure protection, tying it to undersea cable threats that have become a NATO security priority. Baltic and Nordic states are landing on the same practical answer: ports and service denial can do more than a stop-and-board regime at sea.

What Remains Missing

No one outside the drafting circle has seen a Franco-German text, if a coherent text exists. The operational data needed to judge the proposal is also missing: how many shadow-fleet voyages enter EU ports, how many carry detention-grade defects, and how often member states already act.

Without those numbers, tougher wording may produce stronger announcements rather than more immobilised ships. Europe can see more tankers than it can lawfully stop. Whether this initiative changes that depends on legal engineering that has yet to be made public.