US Forces Board Sanctioned Supertanker Off Sri Lanka

US military forces boarded and seized the MT Davina, a sanctioned supertanker carrying nearly 2 million barrels of crude oil, in the Indian Ocean south of Sri Lanka, the Pentagon announced Thursday.

The operation was carried out by US Indo-Pacific Command, marking a widening of sanctions enforcement well beyond the Persian Gulf and Arabian Sea zones where the bulk of anti-Iran maritime operations have concentrated since the naval blockade began on April 13.

“We will continue global maritime enforcement to disrupt illicit networks and interdict vessels providing material support to Iran, wherever they operate,” the Pentagon said in a statement.

The MT Davina, also known as the Lenore, was sanctioned by the US Treasury in October 2024 for its role in Iranian oil trading. The vessel’s seizure off Sri Lanka’s southern coast signals that Washington is prepared to pursue sanctioned tankers across ocean basins, not just in the chokepoints nearest Iran.

A Blockade That Is Working

The boarding comes as data confirms the US naval blockade has inflicted severe economic damage on Tehran. Iran has lost nearly $5.8 billion in oil revenue over April and May alone, according to Al Jazeera reporting published Thursday.

Iran’s crude exports have collapsed from nearly 2 million barrels per day before the blockade to below 300,000 bpd — less than one-sixth of pre-war levels.

Some 147 million barrels of Iranian crude now sit in floating storage aboard tankers with nowhere to deliver, with 67 million barrels stranded in the Gulf itself, according to the Al Jazeera analysis.

Marc Ayoub, an energy analyst cited by Al Jazeera, said Tehran is running out of room to maneuver. “Iran is strategically using the storage capacity it has left,” Ayoub said. “The data shows the blockade is working, but the real pressure comes once that storage starts running out.”

New Sanctions Widen the Net

The Treasury Department on Thursday also designated 12 new entities tied to Iran’s oil smuggling networks, including five companies registered in the Marshall Islands, four in the UAE, and one in China. Six vessels were added to the sanctions list, including four Panama-flagged LPG tankers, according to Middle East Eye.

The new designations target the financial and logistical infrastructure that has allowed Iranian crude to reach buyers despite years of US sanctions. Ship-to-ship transfers, flag-hopping, and shell company ownership structures have long allowed sanctioned oil to move through opaque trading networks. The MT Davina’s seizure suggests Washington is now matching paper sanctions with physical interdiction on a global scale.

Beyond the Gulf

The location of the boarding — the Indian Ocean south of Sri Lanka — carries strategic weight. Most US naval enforcement actions against Iranian oil have taken place in the Persian Gulf, the Gulf of Oman, or the Arabian Sea, areas patrolled by the Fifth Fleet and Central Command.

The MT Davina operation fell under Indo-Pacific Command, a separate combatant command responsible for waters stretching from the western Pacific to the eastern Indian Ocean. That two geographic combatant commands are now conducting tanker interdictions suggests the Pentagon has established a layered enforcement architecture that extends far beyond the immediate theater of operations around Iran.

Iran closed the Strait of Hormuz on February 28, shutting down a waterway through which roughly 20 percent of the world’s oil and natural gas normally transits. The closure forced Iranian crude onto longer, more exposed shipping routes — exactly the kind of routes where vessels like the MT Davina become vulnerable to interdiction.

Compounding Pressure

The seizure adds to a week of compounding blows to Iran’s energy sector. An attack on Oman’s Mina Al Fahal terminal halted crude loading operations earlier Thursday, further tightening supply conditions in a region already strained by the loss of Iranian barrels.

CENTCOM’s most recent tally puts the number of vessels interdicted or diverted under the blockade at 125 and counting. The MT Davina, with its nearly 2-million-barrel cargo, represents one of the single largest seizures of the campaign.

For Tehran, the arithmetic is grim. Revenue has cratered, storage is filling, and the geographic scope of enforcement is expanding. Each tanker seized or turned away narrows the regime’s options for converting its remaining crude reserves into the hard currency it needs to sustain both its war effort and its domestic economy.