International vessel tracking: how the alliance stopped the shadow fleet tanker

This week, a notable event occurred in the Mediterranean Sea — the French naval fleet detained a Russian tanker suspected of being part of the so-called “shadow fleet,” which allows Russia to bypass Western sanctions on oil supplies. The operation was the result of synchronized efforts by several countries and demonstrated increasing coordination in the fight against illegal hydrocarbon trade.

Operation in French waters: synchronized tracking and interception

The detention took place in the open waters of the western Mediterranean, between the coasts of Spain and Morocco. French President Emmanuel Macron confirmed that the operation was carried out with the support of several allies and fully complied with the UN Convention on the Law of the Sea.

The tanker “Grench,” traveling from Murmansk, was flying the flag of the Comoros Islands, which is seen as a sign of using an unauthorized flag. The vessel tracking process involved the participation of British armed forces — the ship HMS Dagger monitored the tanker as it passed through the Strait of Gibraltar. UK Defense Secretary John Hiley emphasized that such vessel tracking was a key element of the joint operation.

Shadow fleet as a tool to bypass sanctions

The EU has imposed 19 packages of sanctions against Russia, but Moscow continues to adapt to restrictions and finds ways to export oil to India and China, usually at reduced prices. A significant portion of these supplies is transported by ships operating outside the Western maritime industry. These ships are called the “shadow fleet” — their activities are secretive and enable circumvention of the monitoring system.

Macron linked the activities of the shadow fleet directly to the financing of Russian aggression against Ukraine. Ukrainian President Volodymyr Zelensky welcomed the operation, calling it a demonstration of necessary resolve, and proposed confiscating oil from shadow fleet tankers for subsequent sale.

Coordination of allies: from monitoring to detention

The detention of the tanker demonstrates how vessel tracking in international waters requires coordinated efforts by multiple states. The case has been handed over to the prosecutor in Marseille, who specializes in maritime law — the vessel has been ordered to change course for further investigation.

Moscow stated that it was not notified of the interception in advance. The Russian consulate in Marseille is attempting to find out whether any Russian citizens are among the crew members. This operation highlights the growing effectiveness of international cooperation in tracking and detaining ships violating sanctions regimes.