The vessel, named Grinch, was stopped by the French navy as it travelled through waters between Spain and Morocco.

France says it has seized an oil tanker in the Mediterranean suspected of being part of Russia’s sanction-busting “shadow fleet”.

French President Emmanuel Macron said the tanker, named the Grinch, was “subject to international sanctions and suspected of flying a false flag”.

The French navy, with the assistance of allies including the UK, boarded the vessel on Thursday morning between Spain and Morocco. French maritime authorities said that a search of the vessel had “confirmed the doubts as to the regularity of the flag”.

Russia’s embassy in Paris said it had not been informed of the seizure.