Russia Claims Mines Found on Antwerp Tanker, Thwarts Attack
Russia’s Federal Security Service (FSB) announced on Monday that two magnetic sea mines were discovered attached to the hull of a liquefied petroleum gas (LPG) tanker after it arrived at the Russian port of Ust-Luga from Antwerp, Belgium, claiming to have thwarted a “terrorist attack.” The allegations remain unverified by independent or Belgian authorities, raising questions about their veracity and potential diplomatic implications.
The Discovery
The Liberia-flagged tanker Arrhenius (26,645 dwt), operated by UAE-based Maple Mariner Holding, arrived at Ust-Luga — a critical Baltic Sea port southwest of St. Petersburg — on May 20 for loading. During a routine diving inspection, part of enhanced port security measures implemented after previous incidents, divers discovered two magnetic devices attached to the hull near the engine room, according to The Maritime Executive.
Each device reportedly contained approximately 7 kg (15 lbs) of plastic explosive. The Russian Investigative Committee described them as “factory-made naval magnetic mines manufactured in a NATO country,” though state news agency TASS suggested the devices may have been homemade rather than of a recognizable NATO design — a discrepancy within the Russian narrative itself, as Meduza reported.
The Voyage Timeline
According to the FSB, Captain Igor Loy of the Arrhenius stated during questioning that the vessel arrived at the Belgian pilot station near Antwerp on May 12 but was ordered to anchor because the port was not ready, allegedly due to a workers’ strike. The ship remained at anchor for approximately 36 hours before docking on May 14. Unloading took roughly 25 hours, and the vessel remained at the terminal overnight before departing on May 16 for Ust-Luga with no intermediate stops, as The Moscow Times reported.
Russian Investigative Committee Spokeswoman Svetlana Petrenko stated that “based on initial investigative actions, it can already be concluded that the magnetic mines could not have been installed in Russia’s territorial waters,” according to gCaptain/Reuters. Russia has opened a criminal case on charges of attempted terrorism and illegal trafficking of explosive devices.
Unresolved Questions and Verification Gaps
Several critical questions remain unanswered. No Belgian government, port authority, or security service has commented on the allegations as of this writing. Ukrainian officials have also not responded. NATO was not immediately available for comment, Reuters reported.
The conflicting descriptions of the mines — factory-made NATO ordnance versus homemade devices — raise further questions about the reliability of the Russian account. The FSB released video footage via Telegram showing the mines on the vessel’s hull, but no independent third party has confirmed their existence or origin.
Broader Context: A History of Port Security Concerns
Ust-Luga has been a repeated target of Ukrainian drone attacks throughout 2025 and 2026. In spring 2026, Ukrainian drones repeatedly attacked the ports of Ust-Luga and Primorsk, temporarily suspending operations. The discovery also follows the February 2025 explosion of the tanker Koala at Ust-Luga’s dock — initially called an accident, later speculated to be a mine blast that made three holes in the hull.
Following these incidents, Russia ordered mandatory diver inspections for all ships entering its ports. The Arrhenius discovery occurred during one such routine inspection.
Analysis: Three Possible Interpretations
Analysts and observers have outlined three broad possibilities for what occurred:
1. Genuine discovery: The mines could have been attached by Ukrainian operatives or sympathizers during the Antwerp stopover as part of asymmetric warfare targeting Russian energy infrastructure. The 36-hour anchorage outside Antwerp would have provided a window of opportunity.
2. False flag operation: Russia could have staged the discovery to justify further escalation, tighten port security, or accuse NATO of direct involvement in sabotage. The conflicting descriptions of the mines and lack of independent verification lend weight to this interpretation.
3. Pretext for escalation: Even if the mines are genuine, Russia may use the incident to justify attacks on NATO-linked shipping or increase pressure on Belgium, which recently boarded a vessel from Russia’s “shadow fleet” and seized a ship in Zeebrugge with a bond exceeding €10 million.
What to Watch For
The key development to monitor is the Belgian government’s official response, which has not yet been issued. The incident could significantly escalate diplomatic tensions between Belgium — a NATO member — and Russia. Additionally, the shadow fleet operations in the Baltic Sea may face further disruption as Russia tightens maritime security protocols. For now, the story remains one of competing narratives, with the truth submerged beneath claims and counterclaims in an ongoing information war.