A coalition of 14 European coastal states has issued a joint warning aimed at vessels operating with the hallmarks commonly associated with Russia-linked “shadow fleet” tankers: frequent reflagging, opaque paperwork and disrupted tracking signals.
The document, published by the UK Department for Transport on 26 January 2026, frames the initiative as a maritime safety and security measure, while explicitly linking the problem to sanctions evasion.
The signatories — Belgium, Denmark, Estonia, Finland, France, Germany, Iceland, Latvia, Lithuania, the Netherlands, Norway, Poland, Sweden and the United Kingdom — address what they describe as a deteriorating operating environment in European waters. The letter highlights growing interference with satellite navigation (GNSS) and manipulation of the Automatic Identification System (AIS), and says these developments increase the risk of accidents and impede rescue operations. The states say the disturbances originate from the Russian Federation and that “all vessels are at risk” in the affected sea lanes, particularly in the Baltic Sea region.
While much of the text focuses on navigation resilience and compliance with International Maritime Organization rules, the letter also sets out a series of practical requirements that, taken together, increase the exposure of vessels that rely on concealment. It stresses that ships must sail under the flag of a single state and notes that vessels using two or more flags “according to convenience” may be treated as ships “without nationality”, citing Article 92 of the UN Convention on the Law of the Sea (UNCLOS).
The statement then lists additional expectations: valid certification and insurance documentation; shipboard safety management systems under the International Safety Management code; and continuous operation of AIS and long-range identification and tracking equipment. It also calls for routine communication with maritime authorities, compliance with routeing systems and local restrictions, and prompt reporting of oil discharges or other harmful releases. The final provisions address ship-to-ship transfers, saying transfers should not take place without timely notification to the coastal state where they occur, and that vessels should carry approved ship-to-ship operations plans.
The practical effect is to draw a bright line between conventional commercial shipping and vessels operating in ways that make responsibility and enforcement difficult. Bloomberg reported that the warning raises the stakes for a network of tankers linked to Russian oil exports and places emphasis on documentation, flag discipline and tracking requirements.
The Baltic and North Seas are central to the calculus. Tankers loading crude at major export hubs in western Russia must transit these waterways before reaching the Atlantic, making the region one of the most controllable choke points available to European coastal states acting in concert.
The letter arrives amid broader steps by European governments to increase monitoring capacity and tighten legal and operational responses in the Baltic theatre. On 26 January, Finland said it was working with the European Commission and other Baltic Sea states to establish a maritime surveillance centre focused on protecting critical undersea infrastructure in the Gulf of Finland — an initiative presented as a response to repeated incidents affecting cables and pipelines since 2022.
Operational enforcement against suspect tankers has also become more visible. On 22 January, Reuters reported that the French navy intercepted a tanker identified as “GRINCH” in the western Mediterranean, with French President Emmanuel Macron citing action under UNCLOS and describing the vessel as part of a sanctions-circumvention “shadow fleet”. The report said the tanker was sailing from Murmansk under a Comoros flag and was subject to sanctions, with the case handed to prosecutors in Marseille.
The joint warning also fits a longer arc of sanctions policy. In December 2025 EU added 41 vessels to its shadow fleet listings, taking the total number of designated ships to almost 600. Earlier, a Reuters report from October 2025 described efforts by the EU’s diplomatic service to secure backing for a maritime declaration designed to facilitate inspections of shadow fleet tankers, working with flag states.
For shipping companies, insurers and flag registries, the immediate message is procedural: operate with one flag, maintain verifiable certification and insurance, keep tracking systems running, and comply with reporting and routing. For vessels that do not meet those standards, the “stateless” designation is a legal warning label that can narrow the protections normally associated with flag-state responsibility, and can make scrutiny by coastal and port authorities more straightforward.
How far the new approach alters Russian oil logistics will depend on implementation: the willingness of authorities to challenge documentation, investigate AIS anomalies and enforce ship-to-ship transfer rules in the waters they control. What is clear is that the 14 states have now put a shared legal framing in writing, anchored in UNCLOS and multiple IMO conventions, and aimed it at a set of operating practices widely associated with the shadow fleet business model.
Risk in European Waters: The Shadow Fleet, Sanctions Evasion and Safety Gaps
