A growing number of tankers in the so‑called “shadow fleet” are switching their registration to Russia after the United States began seizing vessels involved in transporting sanctioned oil, especially linked to Venezuela.
According to Starboard Maritime Intelligence data, at least 26 tankers have re‑registered under the Russian flag since early December, with most changes happening after the US seized the supertanker Skipper off the coast of Venezuela on December 10, 2025.
The shadow fleet consists of vessels that carry oil from sanctioned producers such as Venezuela, Russia and Iran. Many have used flags of smaller states or false registrations to avoid enforcement and operate outside standard maritime regulations.
Ship owners appear to believe that registering under Russia’s flag will offer political protection against US interdictions. Analysts warn this move increases geopolitical risk and highlights that sanction evasion is now a strategic challenge, not just a maritime compliance issue.
The United States has now seized five tankers involved in the Venezuelan oil trade, including the tanker Marinera (previously Bella 1), which was pursued across the North Atlantic and taken under a US warrant after reflagging to Russia. US authorities have also filed court warrants to seize dozens more tankers tied to the Venezuelan oil trade, part of a broader effort to enforce sanctions and curb illicit oil shipments.
Shadow fleet tankers are operating worldwide, from the Baltic Sea to the Suez Canal and the Yellow Sea, showing the global reach of sanctioned oil shipments and the rising pressure from Western enforcement. Maritime operators should expect continued enforcement actions and rising legal and operational risks for vessels linked to sanctioned oil flows.
These developments create serious risks for seafarers. Working on vessels involved in sanctioned trades can expose crew members to legal consequences, detention, and financial liabilities if a ship is seized or flagged for illicit operations. Seafarers need to be aware that even indirect involvement with the shadow fleet can have personal and professional consequences.
Mariners seeking employment are advised to prioritize safety, legal compliance and transparent operators to avoid involvement in illicit or sanctioned shipping activities.
