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Estonia has released surveillance images showing machine guns and sandbagged firing positions mounted on a Russian-flagged liquefied natural gas (LNG) carrier in the Baltic Sea, in what analysts described as a more confrontational stance by Moscow aimed at protecting its civilian fleet and signaling resistance to any Western attempt to board or seize its ships.
The images show fortified machine gun positions on the bridge roof of the Marshal Vasilevskiy, a civilian vessel whose home port is Kaliningrad.
"The images were taken this spring on the Baltic Sea, within Estonia's area of responsibility," a spokesperson for the Estonian Police and Border Guard service said Monday.
Armed guards are common on ships transiting piracy hotspots, but Yoruk Isik, a geopolitical analyst who runs the Bosphorus Observer consultancy, described the move as unprecedented for the Baltic Sea.
"This is a hostile move by Russia to send a message to European Union and NATO nations that it will actively oppose any attempt to detain or inspect its ships," Isik told Reuters.
"There is no justification for a self-defense posture like a machine gun in the Baltic. This clearly shows that the high seas are becoming increasingly lawless," he added.
Estonian journalist Holger Roonemaa wrote on his Substack that an Estonian border guard surveillance plane photographed the Marshal Vasilevskiy in May as it sailed past Estonia's western islands and northern coast en route to Russia's Bolshoi Bor port in the Gulf of Finland.
The images revealed two sandbagged firing positions equipped with military-grade 12.7mm Kord heavy machine guns on either side of the ship's bridge, the first direct photographic evidence of Russia installing military weapons on a civilian vessel.
Roonemaa noted that Marshal Vasilevskiy is not part of Russia's "shadow fleet" of sanctioned oil tankers and does not carry oil to fund Russia's military budget.
Instead, its task is to supply natural gas to the heavily armed Kaliningrad exclave, having made the trip between Bolshoi Bor and Kaliningrad four times since August of last year.
The vessel is owned by sanctioned Gazprom and has itself been sanctioned in several jurisdictions, though not yet by the EU, meaning it faces little legal risk as long as it stays out of Western territorial waters.
Asked why the weapons were installed, an unnamed intelligence officer from the Baltic Sea region told Roonemaa: "My assessment: These weapons were put on board with a 50% purpose of repelling a potential Ukrainian sea drone (attack), and 50% for signaling to Western countries."
According to the source, the Kord machine guns, with an effective range of 2 kilometers, would not be effective against the aerial drone attacks Ukraine has frequently launched against Russia's Baltic Sea ports this year, but could offer some protection against naval drones, even though no such attacks have occurred in the Baltic Sea to date.
Speaking to Roonemaa, Danish naval commander and independent defense analyst Jens Wenzel Kristoffersen said the weapons were intended as a deterrent message.
"It's specifically aimed at authorities who might consider boarding this ship," Kristoffersen said, adding, "if NATO forces were to approach this ship, I believe they would open fire. If a helicopter approached it, warning shots would be possible."
Commodore Ivo Vark, commander of the Estonian Navy, told Roonemaa the ship may be regarded as a military target by Ukraine, given that it supplies natural gas vital to both Kaliningrad's residents and to Russian armed forces stationed there, suggesting Russia's arming of the vessel could be defensive rather than purely provocative.
Vark said if the ship were to open fire on a vessel flying any country's flag, Estonia's Defense Forces would be obligated to protect the attacked vessel within Estonian waters, and the use of firearms in response would be permitted.
Working with the Dossier Center, Roonemaa's investigation found that Marshal Vasilevskiy has carried 50 different passengers since last August, with nearly half having backgrounds in the Russian military, National Guard, or the Federal Security Service (FSB).
One passenger, identified as Dmitri Artemenko, has taken every one of the tanker's journeys between Bolshoi Bor and Kaliningrad since August.
According to his registered residential address, Artemenko is based at military unit 35690, an FSB special operations center located in Balashikha, just outside Moscow.
The disclosure follows broader warnings from Russian officials about protecting maritime trade. "We cannot allow the blockade of our key maritime routes. The Baltic and Black Seas handle the majority of our maritime trade," Nikolai Patrushev, an aide to Russian President Vladimir Putin on maritime affairs, said in an interview published June 15.
"It is crucial to ensure the timely dispersal and combat readiness of the (Russian) fleet, its ability to counter the full spectrum of threats," Patrushev added.
Nine suspected shadow fleet oil tankers, vessels linked to Russia with opaque ownership sailing under flags of convenience to evade Western sanctions since the start of the war in Ukraine, have been seized across Europe since the start of the year, most recently by France on June 26.
The vessel itself was sanctioned by the United Kingdom in October 2024, by Canada in February 2025, and by Australia in December 2025. Gazprom Flot, the vessel's owner, was sanctioned by the EU in April.
A Baltic security official said Marshal Vasilevskiy is unlikely to be seized, since it does not fall into the shadow fleet category and sails under the Russian flag.
"It's hard to say what the Russians are thinking," the official said, adding, "since the Baltic Sea became a NATO lake, Russians have been stressed about anything that is going on over there, so maybe they are just overthinking and overreacting."
The vessel, which can regasify LNG directly into a natural gas pipeline, was inaugurated by Putin in January 2019 as a backup supply route for the Kaliningrad, intended for use if pipeline gas deliveries through NATO member Lithuania are disrupted.
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