Europe Has Seized Nine Russian Shadow Fleet Tankers, and Russia Is Now Arming Its Ships

While the world watches Hormuz, a second fight over tankers has been escalating in European waters. European navies have now seized nine suspected Russian shadow fleet tankers. Russia has answered by putting weapons on at least one of its merchant ships.

Who is boarding

France has done most of the work. French marines have carried out five interceptions since September 2025. In June they seized The Deliver off Sicily. The tanker had sailed from the Russian Baltic port of Primorsk and was flying a false Cameroonian flag.

The UK made its first interception in June, arresting an Indian national during the operation.

Estonia boarded shadow fleet vessels early on, then stopped after Russia scrambled a fighter jet as a warning. That's the Baltic problem in one incident. Tallinn sits a short flight from Russian airbases, and the tankers leaving Primorsk and Ust-Luga pass close to its coast.

What the shadow fleet is

The shadow fleet is the network of old tankers Russia uses to move oil outside the Western price cap and sanctions. The ships are often 15 to 25 years old. They change names and flags, sometimes to registries that don't exist or have lapsed, and they're insured by little-known companies or not insured at all. They often switch off their transponders and transfer cargo ship to ship at sea.

European governments have two reasons to move against them. One is sanctions. The fleet keeps Russian oil revenue flowing. The other is safety. An old, badly maintained, uninsured tanker grounding in the Danish Straits or the Gulf of Finland would leave coastal states paying for the cleanup. Anchors dragged across the seabed have also damaged undersea cables in the Baltic. The tanker Finland detained over the Estlink 2 cable damage at the end of 2024, the Eagle S, was tied to the shadow fleet.

Russia's armed response

In spring this year, Estonian surveillance photographed an automated machine gun mounted on the Marshal Vasilevskiy, a Gazprom LNG tanker, in the Baltic. It's the first documented case of a Russian civilian ship carrying a weapon aimed, in effect, at anyone who might try to board it.

Moscow's language has hardened too. Russia calls the interceptions an illegal blockade. On June 15, Nikolai Patrushev, the Kremlin aide who handles maritime affairs, spoke about the need to ensure the "combat readiness" of the Russian fleet and "its ability to counter the full spectrum of threats." Russian warships have escorted tankers through the Channel and the Baltic before, and there's every reason to expect more of it.

Why it matters for shipping

For legitimate operators, the enforcement campaign is mostly good news. It squeezes an uninsured, unsafe fleet that competes unfairly for cargoes and puts everyone's coastlines at risk.

But the risks are real. An armed tanker changes the rules for any boarding team. A confrontation between a European boarding party and an armed Russian merchant ship, or with a Russian warship escort, could escalate fast in narrow, busy waters. The Baltic, the Danish Straits and the Channel carry huge volumes of normal traffic.

There's also a link to the Gulf. The Hormuz closure has made every barrel outside the Gulf more valuable, and Russian crude has been one of the big winners in revenue terms. That raises Moscow's stake in keeping the shadow fleet moving, and it raises the pressure on Europe to stop it.

Both sides are escalating, and neither has a reason to stop. The shadow fleet started as a sanctions workaround. It's becoming a maritime security front of its own.