Mines found on the Arrhenius tanker
Russian authorities said on May 25, 2026, that magnetic mines had been found on the hull of the Arrhenius, a Liberia-flagged LPG tanker that had arrived at the Russian port of Ust-Luga from Antwerp. The vessel was due to load liquefied petroleum gas before sailing to Samsun, Turkey. Moscow described the case as an attempted terrorist attack and claimed that the devices were made in a NATO country. However, this accusation remains unverified, and NATO has denied mining any tanker.
A sensitive case in Baltic maritime security
The incident comes at a time when the Baltic Sea is already under strong security pressure. Russia has increased underwater inspections in its ports after previous suspected sabotage cases involving tankers and energy infrastructure. For maritime operators, the case shows how commercial vessels, ports and energy routes can become exposed to hybrid threats, including sabotage, intimidation and information warfare.
This episode also highlights the importance of careful reporting. The presence of explosive devices on a merchant ship would be a serious maritime security issue, but Russia’s political framing should not be accepted without independent evidence. For Europe, the priority remains the protection of ports, sea lanes and energy flows, while avoiding the spread of unverified claims.
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