The UK will sanction as many as 100 oil tankers that it says are part of a shadow fleet of vessels helping Russia to move its oil.

Britain will sanction a Russian shadow fleet of up to 100 tankers on Friday, as European leaders gather in Oslo for a military meeting, seeking to exert extra pressure on Moscow's economy.

The Kiwala tanker, which was detained by the Estonian Navy, is waiting to load oil at the port of Ust-Luga. The Estonian authorities were forced to release the vessel, as they eliminated all technical claims on board,