Investigators have quizzed a shipping business based in or around Glasgow in connection with suspected links to Russia’s “shadow fleet,” which is believed to help Russia move oil while avoiding international sanctions.

The inquiry relates to companies and intermediaries that may provide shipping, brokerage, or related services connected to vessels thought to be operating under sanctions circumvention networks. Prosecutors and law-enforcement officials have indicated that scrutiny is focused on financial and logistical roles that could enable sanctioned oil shipments to continue.

The case has highlighted how sanctions enforcement has increasingly moved beyond the tankers themselves to the businesses and individuals involved in arranging cargo routes, documentation, and associated services.

Separate reporting around European and UK actions against “shadow fleet” tankers has described multinational operations targeting suspect vessels intercepted at sea and held while investigations proceed, underscoring the wider pressure on the network.