By Gavin Blackburn & Serge Duchêne, Sertaç Aktan

France and its allies detained a sanctioned Russian oil tanker in the Atlantic over the weekend, President Emmanuel Macron said on Monday.

According to a prosecutor, the Russian captain of the seized tanker refused to comply with the French navy's orders, and "taking control of the vessel proved necessary".

The Brest prosecutor's office said that a criminal investigation had been opened over failure to prove a vessel's nationality, absence of a flag and refusal to comply.

The Tagor was detained on Sunday morning in international waters with the help of the United Kingdom and other partners, he said in a social media post.