The Russian shadow fleet moved heavily through the Gulf of Finland in October 2025: a Swedish-language investigation by Yle registered 31 EU‑sanctioned tankers in a single week, many of them older vessels, prompting fresh warnings over safety and the environment.
The ships mainly shuttle crude and refined products between Russia’s oil terminals and global routes, highlighting how Moscow continues to circumvent EU sanctions and why Nordic authorities say monitoring gaps persist.
Yle mapping finds 31 sanctioned tankers in one week
Svenska Yle’s week‑long mapping identified 31 tankers listed for sanctions evasion by the EU operating in the Gulf of Finland. Traffic routinely centers on Russia’s export hubs at Primorsk and Ust‑Luga, with some vessels anchoring for days awaiting orders before exiting the gulf. Many of the tankers carry crude oil, while others load gasoline and diesel bound for non‑EU markets.
Aging ships raise environmental and safety risks
A significant share of the vessels are older than 15 years, the threshold after which the Oil Companies International Marine Forum (OCIMF) requires stricter inspections. Yle’s sample included ships up to 34 years old; only six were younger than 15.
According to Magnus Winberg, a sea captain and navigation lecturer, ships outside standard vetting and port state control regimes can have unclear maintenance records and poorly documented crew competencies. That combination heightens the risk of groundings, equipment failure and oil spills in the shallow Baltic.
Cost of a spill could reach €1 billion
Experts warn that a major spill from these shadow fleet tankers could be catastrophic for the gulf’s sensitive ecosystem and for coastal economies in Finland and Estonia. Cleanup alone could cost up to €1 billion, not counting longer‑term ecological damage. With many vessels sailing under high‑risk flags and with opaque insurance, the financial burden of response and remediation could fall on the affected coastal state if coverage proves invalid.
EU widens the net as the shadow fleet adapts
While the EU sanctions architecture has progressively tightened since 2022, operators have responded with complex ownership chains, frequent name and flag changes, and routing that avoids EU ports to stay outside inspections and services bans.
As of late October 2025, the EU’s consolidated list includes hundreds of designated vessels tied to Russia’s shadow oil trade, subject to port‑access prohibitions and bans on bunkering, repairs and provisioning within the Union. Analysts argue that expanding designations and enforcement coordination—including outreach to permissive flag registries—is key to reducing volumes moved by these vessels.
What Nordic authorities can and cannot do at sea
Finland’s Transport and Communications Agency (Traficom) leads port state control in Finnish waters, but legal tools are limited when sanctioned tankers bypass EU harbours altogether. Without port calls, authorities have fewer options to verify seaworthiness, insurance and crew qualifications.
Nordic coast guards have increased surveillance and presence to deter unsafe practices, yet boarding and inspection powers remain constrained on the high seas or in transit when no distinct violation is observed.
Why the Gulf of Finland matters
The Gulf of Finland is a narrow, busy corridor where dense traffic, shallow waters and winter ice compound risk. It is also a strategic artery for Russia’s energy exports, placing the Nordic‑Baltic region at the intersection of security, environmental protection and sanctions enforcement.
For EU‑Nordic policymakers, the episode underscores two imperatives: reduce spill risk from aging, under‑insured tankers and close sanctions‑evasion loopholes that still fund Russia’s war economy.
The latest Yle investigation offers a snapshot: “31 sanctioned tankers in one week” is a high density for such a constrained waterway. With the shadow fleet expanding and adapting, tougher, coordinated enforcement and clear liabilities will be central to safeguarding the Baltic Sea and upholding the EU’s sanctions regime.
