UK Prime Minister Keir Starmer announced that British commando forces will be able to board and stop vessels from Russia’s “shadow fleet” as they pass through UK waters.

According to PA Media, Starmer said the UK will join its Northern European allies in tracking and halting tankers that violate sanctions on Russia, doing so “with greater force.”

He confirmed that the government has approved plans to begin seizing vessels linked to the shadow fleet, ahead of his trip to Finland for a summit of the Joint Expeditionary Force (JEF).

The JEF is a UK-led military coalition of 10 Northern European countries, aimed at countering Russian activities.

Members include Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, the Netherlands, Norway, and Sweden.

Russia’s so-called shadow fleet is believed to consist of more than 1,000 aging tankers used to circumvent international sanctions.