Europe’s active enforcement tests shadow fleet resilience

The recent French interception of 2004-built, Russia-linked tanker Grinch in the Mediterranean Sea – supported by the United Kingdom – marked a turning point in Europe’s stance toward shadow-fleet operations. The vessel was detained over irregular documentation and suspected links to sanctioned oil exports.

At the same time, 14 European nations recently issued a co-ordinated warning to vessels implicated in shadow-fleet activities, stressing that non-compliance with international safety and maritime regulations could expose ships to boarding or interdiction by national navies.

“This marks a shift from sanctions lists to operational enforcement in European waters and key sea routes,” Intermodal head of research Yiannis Parganas told Riviera. “Europe appears poised to continue tightening enforcement, further destabilising segments of the shadow fleet that have so far proven resilient to earlier measures,” he added.

Kpler senior risk and compliance analyst Dimitris Ampatzidis noted that these actions, if combined with heightened refinery oversight – particularly to block imports from facilities that have handled Russian grades in the past 60 days – could place substantial pressure on the shadow fleet.

“This approach significantly increases both the risk and the cost for those attempting to circumvent sanctions,” he said.

Mr Parganas also highlighted that Europe’s actions coincide with stepped-up US enforcement targeting sanctioned shipping linked to Venezuela, including the recent seizure of tankers.

“The dual pressure from Europe and the US is raising legal risks for operators of sanctioned tonnage, compressing available capacity in the informal markets where shippers once sought to conceal cargo origins,” he said.

According to Mr Parganas, the tightening environment may support tanker freight rates on certain trades and widen discounts on sanctioned barrels, as routes become more circuitous and insurance more difficult to obtain. 

Addressing false-flagging

The joint statement by the 14 European nations also warned that vessels operating under multiple or unclear flags may be treated as ships without nationality. Grinch – the tanker seized by France – was sailing under a fraudulent Comoros flag, according to Equasis.

Reflagging and ownership restructuring have long blunted enforcement efforts against the shadow fleet, underscoring the need for tighter legal frameworks.

The International Chamber of Shipping (ICS) this week released its 2025–2026 Flag State Performance Table, assessing which flag administrations demonstrate strong or weak performance. Several states showing numerous ’red squares’ – indicating potentially poor performance – are the same registries that have drawn scrutiny in recent years for hosting shadow-fleet vessels.

“ICS encourages shipowners and operators to use the table to assess whether a flag state has real substance, and to put pressure on their flag administrations to implement any necessary improvements,” ICS secretary general Thomas Kazakos said.

A recent analysis by Windward found that roughly 285 internationally trading tankers were broadcasting AIS signals under fraudulent or unknown registries. The study identified 18 such false registries, with around 91% of these vessels already sanctioned by Western authorities.