UK defends seizing shadow fleet tanker after Putin threat

The UK government has defended its seizure of a Russian "shadow fleet" oil tanker in the English Channel, after Russian President Vladimir Putin threatened to "respond in kind".

The Smyrtos was taken to be anchored off Weymouth after Royal Marines Commandos intercepted and boarded it in a first-of-its-kind operation to disrupt the sanctioned tanker in June.

The vessel's captain, Ajay Pant, has been charged with breaching Russian sanctions, accused of directly or indirectly supplying or delivering prohibited Russian oil.

Overseeing Russian navy drills in the Pacific Ocean, Putin scolded Western countries for "seizing our vessels", branding such action "nothing other than piracy and banditry".

"If these plans are put into practice, we will have to respond in kind," Putin warned on Wednesday.

"And not necessarily in the waters where raids on our ships and vessels are planned, but wherever we deem it necessary and appropriate, anywhere."

Viktor Liina, commander of Russia's Pacific Fleet, accused Western countries such as Britain and France of operating their own "shadow fleets".

"We have the capacity to inspect and detain vessels of unfriendly states and their shadow fleets, and interagency cooperation is in place, ready to begin addressing these challenges," Liina said.