Belgian special forces boarded the Ethera, which was sailing under the flag of Guinea, on Saturday night

Belgium has seized an oil tanker believed to form part of the so-called “shadow fleet” used by Russia to circumvent western sanctions over the war in Ukraine.

Special forces assisted by French helicopters boarded the ship in a clandestine operation in the North Sea on Saturday night, Belgium’s defence minister, Theo Francken, said on Sunday.