Last year, Russia ordered divers to inspect ships in its ports, after suspected attacks on four oil tankers. The Suezmax tanker Koala ran aground at Ust-Luga after a blast in its engine room in February 2025.
According to LSEG ship tracking data, Arrhenius is Liberia-flagged and is managed by the Maple Mariner Holding in the UAE.
A spokesperson for Russia’s Investigative Committee, Svetlana Petrenko, said that the mines were produced by a NATO country. She said the vessel, which entered Ust-Luga on May 20, was scheduled to sail to the Turkish port of Samsun.