United States seizes three Iran-linked tankers carrying $600M in crude

The US government has seized three tankers linked to Iranian sanctions in the Atlantic and Indian Oceans, capturing nearly six million barrels of crude oil valued at roughly $600 million. The Pentagon confirmed the successful interdictions, which targeted vessels allegedly tied to Iran’s Islamic Revolutionary Guard Corps and Venezuela’s state oil company, Petroleos de Venezuela S.A.

Three ships, three stories

The seizures unfolded over a span of roughly two months, each involving a different vessel with its own trail of alleged deception.

The Skipper was the first to fall, seized in late December 2025 while carrying approximately 1.8 million barrels of crude. A forfeiture complaint filed by US authorities alleged the shipment was supporting the IRGC, Iran’s powerful military branch that the US designated as a foreign terrorist organization years ago.

Next came the Marinera, formerly known as the Bella 1. US forces captured the vessel in early January 2026 after a multi-week pursuit across the North Atlantic. Authorities linked the ship to Hezbollah, the Iran-backed militant group, and said the crude originated from Iran.

The third seizure, the Bertha, occurred on February 24, 2026 in the Indian Ocean. Flagged in the Cook Islands, the tanker was carrying approximately 1.9 million barrels of heavy Merey crude, a grade associated with Venezuelan production. Its destination was reportedly China, one of the primary buyers of sanctioned crude from both Iran and Venezuela.

The shadow fleet playbook

These tankers employed a toolkit that has become standard practice for shadow fleets, the loosely organized networks of aging tankers that move sanctioned crude around the world. The playbook includes frequent name changes (the Marinera had previously been the Bella 1), reflagging under obscure jurisdictions like the Cook Islands, and manipulating or disabling AIS transponders, the automatic identification systems that broadcast a ship’s location. Ship-to-ship transfers in open water allow cargo to change hands without ever touching a port, making it harder for authorities to trace the oil back to its origin.

Under the Trump administration’s announced blockade strategy, the Navy and Coast Guard have shifted toward direct confrontation on the open sea rather than relying primarily on financial penalties against intermediaries.

Oil market ripple effects

Six million barrels is not a trivial amount. For context, global oil consumption runs at roughly 100 million barrels per day, so the seized volumes represent a little over an hour of worldwide demand.

The geopolitical dimensions cut deeper than commodity pricing. Iran’s oil revenues fund the IRGC and its network of proxy forces across the Middle East, including Hezbollah. Venezuela’s PdVSA, meanwhile, is the economic lifeline of the Maduro government. Every barrel seized is a barrel that doesn’t generate hard currency for Caracas.