The Marinera, part of a 'shadow fleet' evading sanctions, was reportedly en route to a Scottish port and had recently changed its flag from Guyanese to Russian.
Russia's transport ministry stated the seizure breached international maritime law, with a Kremlin adviser warning of a potential 'crisis situation' in US-Russia relations.
UK Defence Secretary John Healey condemned the vessel as part of a 'Russian-Iranian axis of sanctions evasion' and affirmed Britain's commitment to combating such activities.
These seizures occur amid broader global tensions, including a diplomatic dispute over Greenland, which British military figures have urged Sir Keir Starmer to defend more robustly.