How Russia's shadow fleet forced Europe back to sea

Europe's strategy to prevent Russia from funding its war in Ukraine through oil revenues involved imposing sanctions, regulations, and caps. Despite these efforts, Russia's shadow fleet of ships continued to evade restrictions, leading Western governments to deploy aggressive maritime measures. As of May 2026, there were identified to be 1,404 vessels belonging to Russia's shadow fleet, typically old, uninsured, and registered in countries with fewer regulations.

Moscow used these ships to transport mostly oil and other sanctioned products like grain taken illegally from occupied Ukrainian territory.

In June 2024, the EU first sanctioned individual ships in the shadow fleet, leading to an increasing number of sanctions. By July 2026, 692 ships were on the EU's list, with many other countries adding their own sanctions. The U.K. and the U.S. have also sanctioned significant numbers of these vessels, while Canada and Australia have sanctioned 731 and 262, respectively.

Despite the sanctions, Russia's shadow fleet continues to sail, and enforcement remains a challenge. European countries share a confidence in their legal position when they act, leading to more regular interceptions of suspected shadow fleet ships. Sweden began intercepting Russian shadow fleet vessels in March and seized the first ship, the Caffa, which was carrying illegally obtained grain from Ukrainian territory. Other countries such as the U.K., France, and Belgium have also seized ships belonging to the shadow fleet.

The success of these efforts is attributed to increased coordination among European countries and the differing postures of Moscow and Washington. The U.S. seizure of a Russian-flagged oil tanker in the Atlantic Ocean also encouraged a more assertive approach among European countries.