France, Oct. 1 -- France has opened an investigation into a Russian-linked oil tanker anchored off Saint-Nazaire on the Atlantic coast. The vessel is suspected of being part of Moscow's "shadow fleet" and has been named in Denmark's inquiry into mystery drone flights that disrupted air traffic last month.

The 244-metre tanker, called Boracay but also known as Pushpa and Kiwala, has been anchored near French territorial waters off the Saint-Nazaire wind farm for several days.

It sails under a Benin flag and left the Russian port of Primorsk, near Saint Petersburg, on 20 September.

The Brest prosecutor's office said it opened the investigation after a report from the navy.

Prosecutor Stephane Kellenberger told the French news agency AFP...