French police have arrested the captain and first officer of a sanctioned tanker suspected of operating for Russia's "shadow fleet", authorities said on Thursday, after the navy boarded the vessel, which may have been involved in recent drone incidents around Denmark. Remove ads“Thanks to our Navy commandos and to the crews of the French Navy who intervened this weekend on board a Russian shadow fleet tanker, currently anchored off Saint-Nazaire,” Prime Minister Sebastien Lecornu wrote on X. Although President Emmanuel Macron has welcomed the probe into the vessel, estimating that Russia’s “shadow fleet” contains 600 to 1,000 ships, French authorities have been tight-lipped about the investigation. French and Danish authorities have declined to comment on whether the French probe is related to the drone incursions. Remove adsMacron said on Thursday it was important to get to the bottom of what happened in Denmark, adding that Russia’s shadow fleet represents an important part of Moscow’s business model and pressure should be placed upon it.