Russian-operated shadow tankers, laden with millions of dollars’ worth of sanctioned oil, are navigating the English Channel, sparking concerns about a possible military escalation within NATO-controlled waters, as per recent reports.

This development occurs amid escalating tensions between Russia and NATO. In response, the Royal Navy has intensified its monitoring of vessels sanctioned by the US and its allies, in one of the globe’s most trafficked maritime passages.

According to Sky News, approximately 800 of these shadow tankers have traversed the channel, continuing to financially support Russian President Vladimir Putin’s ongoing conflict in Ukraine.

Among the tankers linked to Russia are the Rigel, Hyperion, and Kousai, which have been tracked by VesselFinder and are recognized as being under Western sanctions.

The report highlighted that three of these vessels were observed this month, transporting sanctioned crude while navigating through the channel.

The Rigel, an 885-foot Suezmax-class tanker registered under the Cameroonian flag, departed the Russian port of Primorsk on February 2nd. It was carrying up to one million barrels of oil, with an estimated value of $55 million.

Sanctioned by the UK, the EU and Canada, it is barred from using port facilities in those jurisdictions but is still permitted “innocent passage” under maritime law.

The Kousai, sailing under a Sierra Leonean flag, left Ust-Luga on Feb. 2, and was warned by authorities to provide proof of insurance within 24 hours.

The Hyperion, also sanctioned by the US, switched flags after delivering oil to Venezuela, to obscure ownership and evade enforcement, according to reports.

Security experts warned of an increased risk of geopolitical escalation in the region.

Professor Michael Clarke told Sky News that there may come a point when Britain and its allies “get much tougher with these Russian ships,” adding that a “militarized confrontation at sea” this year is a real possibility, in the Channel or the North Sea.

A UK Ministry of Defense (MoD) spokesperson said: “Deterring, disrupting and degrading the Russian shadow fleet is a priority for this government.

“Alongside our allies, we are stepping up our response to shadow vessels — and as the Secretary of State set out, we will continue to do so,” the spokesperson said.

The MoD said it has requested proof of insurance from more than 600 suspected vessels since October 2024.

The U.S. has also taken a firm stance, seizing at least seven tankers linked to sanctioned oil trades since December 2025, including several in the Caribbean.