France seized a sanctioned Russian oil tanker named Tagor on May 31, 2026, over 400 nautical miles west of Brittany in the Atlantic Ocean. The French Navy boarded the ship with support from the UK and other allied forces, detaining it for further investigation under international law and at the request of the public prosecutor [1, 2, 3, 4, 5, 6, 7, 8].
The Tagor was sailing from Murmansk, Russia, and was suspected of flying a false Cameroonian flag to evade EU sanctions imposed over Russia's invasion of Ukraine. It had also frequently changed flags, last transmitting its AIS signal off Norway under a Madagascan flag. The vessel was nearly empty when boarded and had 23 crew members onboard [2, 3, 5, 6, 7, 8].
The tanker is linked to Russia's so-called "shadow fleet," a network of around 600 ships trying to bypass sanctions on Russian oil exports. France has boarded three other Russian-flagged or connected sanctioned vessels since September 2025, marking the fourth such action [1, 9, 4, 5, 6, 8].
French President Emmanuel Macron condemned the tanker’s activities, saying, "It is unacceptable for ships to circumvent international sanctions, violate the law of the sea, and fund the war that Russia has been waging against Ukraine for more than four years." He warned that such vessels "also pose a threat to the environment and to everyone's safety" [1].
The Kremlin denounced the seizure as "illegal" and said it was "bordering on international piracy," with spokesman Dmitry Peskov adding Russia was taking measures to protect its cargo [1].
Before its seizure, Tagor was heading toward Limbe, a port on Cameroon's coast. Guillaume Le Rasle, spokesman for the Atlantic maritime prefecture, said, "The decision to divert it was taken Sunday evening. The objective of the diversion is to verify the validity of its flag." The French Navy is currently escorting the tanker for further checks [5, 6, 7, 8].
The detention comes after the UK government in March 2026 authorized military boarding of sanctioned Russian ships in UK waters, while a French court sentenced in absentia a shadow fleet captain earlier that year for failing to comply with stop orders [1, 2, 3, 4, 5].
