US and UK Forces Seize Russian-Flagged Oil Tanker in Major Sanctions Enforcement Operation

Washington: In a significant escalation of its Venezuela sanctions enforcement, the United States military and Coast Guard have seized a Russian-flagged oil tanker, the Marinera, in the North Atlantic Ocean after a dramatic weeks-long pursuit, officials said. The operation was supported by the United Kingdom, with British Defence assets providing surveillance and coordination.

The Marinera—formerly known as the Bella 1—was intercepted under a warrant issued by a U.S. federal court for alleged violations of U.S. sanctions related to the transportation and smuggling of Venezuelan and Iranian oil. The tanker had repeatedly resisted Coast Guard boarding attempts off the Caribbean and attempted to evade capture by re-flagging itself under Russia’s registry mid-voyage.

In a coordinated follow-up action, U.S. forces also seized a second vessel, the M Sophia, in the Caribbean Sea. The U.S. Southern Command described this vessel as a “stateless, sanctioned dark fleet motor tanker” engaged in illicit activities, and the Coast Guard is now escorting it to U.S. custody.

International and Legal Response

The United States frames the operations as part of a broader effort to enforce sanctions and crack down on what Washington calls a “shadow fleet” of tankers used to violate international sanctions against Venezuela, Iran and other state actors. Officials have justified the seizure as lawful under U.S. sanction enforcement and maritime jurisdiction in international waters.

Russia has strongly condemned the seizure, with the Russian Transport Ministry calling it a violation of the 1982 UN Convention on the Law of the Sea, asserting that freedom of navigation on the high seas prohibits use of force against vessels lawfully registered under another nation’s flag. Moscow has also demanded humane treatment and timely repatriation of Russian crew members.

Context and Strategic Implications

The interception of the Marinera marks one of the first known instances in recent memory of U.S. forces seizing a Russian-flagged vessel on the high seas as part of sanctions enforcement. The action comes amid broader U.S. pressure on Venezuelan oil exports and follows earlier U.S. naval operations targeting sanctioned tankers linked to the so-called “ghost fleet.”

The United States has described the campaign as part of its effort to curb funds that may fuel terrorism, conflict and illicit networks. British Defence Secretary John Healy said the Russian-linked shadow tanker fleet has been used to move sanctioned oil that could potentially undermine global sanctions regimes.

While the presence of Russian naval assets was reported during the Marinera pursuit, there was no direct confrontation. The operation reflects rising tensions between Washington and Moscow over sanctions and strategic maritime enforcement.

Both seized vessels are expected to be brought to the United States for legal proceedings and further investigation into their alleged roles in sanctions evasion.

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