French Military, Aided by Britain, Intercepts Russian Shadow Fleet Oil Tanker

French military successfully intercepted an international sanctions-targeted oil tanker in the Atlantic Ocean on Sunday, 31 May local time. The vessel, named Tagor, is believed to be part of Russia’s shadow fleet (a network of ships with unclear ownership structures used to circumvent sanctions).

President Emmanuel Macron confirmed the operation received full support from Britain. According to maritime authorities, armed personnel boarded the Tagor approximately 400 nautical miles west of Brittany. Upon detention, the vessel was found flying a false flag.

“It is utterly unacceptable for vessels to circumvent international sanctions, violate maritime law, and finance the war Russia has waged against Ukraine,” Macron stated on social media platform X.

The British Ministry of Defence confirmed to the BBC that a military helicopter from HMS Somerset was deployed to assist with tracking and monitoring during the French operation. This move is characterised as demonstrating commitment to cutting off funding streams financing Russia’s invasion.

Moscow responded severely to the incident. Kremlin spokesperson Dmitry Peskov called the unilateral seizure illegal and in violation of law. “This illegal seizure borders on international piracy,” Peskov stated. He added that Russia is taking necessary measures to ensure the safety of its cargo.

Since launching its full-scale invasion of Ukraine in 2022, Russia has operated a shadow fleet comprising tankers with unclear ownership structures. This tactic is employed to evade international sanctions on their oil exports.

For France, Tagor represents the fourth shadow fleet vessel to have its transit disrupted since September 2025. Previously, French authorities had tended to allow such vessels to continue sailing after owners paid fines. However, Paris now pledges to completely block their activities.

This defence cooperation aligns with British Prime Minister Sir Keir Starmer’s March policy authorising military forces to board sanctioned Russian vessels. Nevertheless, BBC Verify analysis reveals significant challenges remain, as nearly 200 Russian shadow fleet vessels were recorded entering British waters through mid-May, despite Britain’s claims of continuous efforts to disrupt and deter their movement.