French soldiers have boarded an oil tanker believed to be part of Russia's 'shadow fleet', used to evade sanctions imposed because of the war in Ukraine.

The Boracay left Russia last month and was off the coast of Denmark when unidentified drones forced the temporary closure of several airports last week. It has been anchored off western France for a few days.

French President Emmanuel Macron stated that the crew had committed 'serious offences', although details were not disclosed.

Kremlin spokesman Dmitry Peskov remarked that Russia had no knowledge of the vessel.

Sources have indicated that French military personnel boarded the vessel recently. Macron did not comment on whether the ship could be connected to the disruptive drone activities in Denmark.

Prosecutors in Brest are investigating the ship for two primary counts: refusing to stop when ordered and failing to justify its flag's nationality.

Western nations have enforced sanctions on Russian energy sectors, capping oil prices and limiting imports since the onset of Russia's full-scale invasion of Ukraine in 2022. In response, Moscow has developed a 'shadow fleet' of tankers to hide ownership and operations.

French officials estimate that this fleet comprises between 600 and 1,000 vessels, actively participating in the export of Russian oil.

The Boracay itself is registered under the flag of Benin but is subject to UK and EU sanctions against Russia. Earlier in the year, it was detained by Estonian authorities for sailing without a valid national flag.

The ship embarked from the Russian port of Primorsk on September 20 and traveled through significant maritime routes before altering course towards France after being tracked by a French warship.

In recent meetings, EU leaders, facing increased pressure to enhance European defense capabilities, have discussed the rising number of Russian incursions into EU airspaces. Amid ongoing threats, particularly in Eastern Europe, member states are considering a multi-layered 'drone wall' to address aerial security challenges.

Danish authorities have linked recent drone disruptions to heightened security threats but have not found direct evidence implicating Russia.