Panama's decision to restrict three tankers tied to Iranian oil, Bitu, Starway, and Mackerel, and to begin canceling their registrations is a concrete step, but it is not the finish line. The Panama Maritime Authority acted under Executive Decree No. 512, which was designed to accelerate the removal of vessels linked to international sanctions lists. That mechanism, in place since October 2024, has already led to the cancellation of 107 ship registrations by March 2025, with another 18 in process at the time. This latest move, prompted by the October 8, 2026 OFAC sanctions list, shows the system works, but its pace remains worth watching. The three tankers are still flying the Panamanian flag while proceedings continue, and the authority itself noted that vessel-tracking databases may take time to reflect changes. For readers tracking the movement of sanctioned cargo, that lag is a practical vulnerability.
These tankers carried substantial volumes of Iranian oil products: Bitu transported more than 170,000 barrels of asphalt and bitumen in 2026 alone, Starway moved over 3 million barrels of Iranian naphtha since 2025, and Mackerel hauled more than 500,000 barrels of high-sulphur fuel oil since December 2025. The vessels' ownership is spread across registries in the Marshall Islands and China, illustrating the fragmented nature of maritime sanctions evasion. This is not an isolated pattern. As we have reported, Iranian vessels have been stranded off Sri Lanka under similar supply and compliance pressure, testing how far sanctions can stretch before breaking points appear. Meanwhile, U.S. enforcement on the domestic side has been tangible: federal seizures of over 620,000 gallons of fuel in two states demonstrate that the supply chain is being squeezed at multiple nodes.
What makes Panama's action meaningful is not the symbolic removal of a few hulls. It is the precedent that a major flag state can use executive authority to police its registry in near real-time, without waiting for international bodies to move first. The AMP also confirmed that six vessels on the United Kingdom's October 8 sanctions list targeting Russia's shadow fleet had already been removed from Panama's registry before those sanctions were announced. That suggests proactive screening, not reactive compliance. For an audience that tracks the intersection of ocean governance and geopolitical pressure, the question is whether this pace can scale. If Panama sustains this cadence, other flag states may face practical pressure to match it, especially as the U.S. and U.K. continue to expand their lists. The open detail to watch is whether the cancellation of Bitu, Starway, and Mackerel concludes within weeks or drags into months, that timeline will reveal whether Executive Decree No. 512 is a tool or a formality.