A growing fleet of aging, poorly maintained tankers is enabling both the Kremlin and the Iranian regime to profit from the continued sale of sanctioned oil, posing significant risks to global maritime security and the environment.
Known as the “shadow fleet,” these vessels – numbering approximately 1,400 – operate outside of normal regulatory frameworks, transporting oil from Russia, Iran, and Venezuela to buyers in countries like India and China. These ships are frequently uninsured, lack proper maintenance, and often operate with unclear ownership, frequently changing flags or having no registered nation at all. They also routinely disable or falsify their Automatic Identification System (AIS) transponders, hindering tracking and raising safety concerns.
The risks associated with this shadow fleet are substantial. Beyond potential damage to underwater infrastructure – including the cables that carry over 95% of global data – these vessels pose a significant pollution threat. Approximately 6,000 sailors were abandoned on 410 ships in 2025 without pay or provisions, and it is estimated that at least 100 vessels are currently adrift at sea, potentially carrying hazardous cargo like ammonia.
Legal Hurdles to Intervention
Intervening against these vessels is complicated by international law, which makes it difficult to board and seize ships on the high seas. The Trump administration demonstrated one approach in 2025, when U.S. Special forces boarded the tanker “Bella 1” off the coast of Iceland.
The “Bella 1” incident highlighted the tactical and legal complexities involved. Concerns about potential armed resistance led officials to initially hesitate to deploy a standard helicopter boarding team. U.S. Navy SEALs were deployed from specialized MH-6 “Little Bird” helicopters capable of landing on the tanker’s deck.
The “Bella 1,” later renamed “Marinera” and re-registered in Russia, was escorted to waters off Scotland and remains there. Legal challenges followed, including a court case in Edinburgh brought by the captain’s wife attempting to prevent his extradition to the U.S. Despite the court ruling in her favor, the captain and his first officer were ultimately transported to the U.S.
France, Finland, Germany, and Estonia have all taken enforcement actions, including seizures and detentions. Increasingly, ships are registering under the Russian flag, but even with that, Russia would be unable to protect all of the vessels. The United Kingdom has offered limited assistance, focusing on anti-money laundering measures rather than maritime law enforcement.
Frequently Asked Questions
What is the “shadow fleet”?
The “shadow fleet” consists of roughly 1,400 illegal, unregulated oil tankers used to transport sanctioned oil from regimes like Russia, Iran, and Venezuela to buyers in countries like India and China.
What risks do these ships pose?
These ships are poorly maintained, uninsured, and pose a threat to underwater infrastructure, marine environments, and global data transmission, as they damage underwater cables. They also frequently abandon crews without pay or provisions.
What has been done to address the issue?
The U.S. Has conducted at least eight seizures of vessels connected to the shadow fleet since December 2025, while other nations like France, Finland, Germany, and Estonia have also taken enforcement actions.
As these vessels continue to operate with impunity, questions remain about the international community’s ability to effectively address this growing threat. What further steps might be taken to disrupt this network and mitigate the risks it poses?
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