Nearly 40 million barrels of Iranian crude sit on tankers near Malaysia, beyond the U.S. blockade, testing the Trump administration's 'zero leakage' pledge to cut off Tehran's revenue.
Nearly 40 million barrels of Iranian crude are sitting on tankers in waters near Malaysia, east of Singapore, far beyond the U.S. naval blockade at the mouth of the Persian Gulf. The cargo amounts to roughly 20 very large crude carriers' worth of oil, a floating stockpile that could still turn crude into cash even as the blockade sharply restricts fresh exports. The stash is now the clearest test yet of the Trump administration's promise of a "zero leakage" squeeze on Tehran.
Iran has an estimated 80 million barrels of crude held in floating storage, with roughly half aboard vessels near Malaysia, according to Reuters data cited in the report. The tankers moved beyond the blockade line before it tightened, which means Washington now faces a different challenge: stopping Tehran from monetizing oil the blockade did not trap.
If Iran can still convert that crude into cash, the regime can use the proceeds to pay for imports and potentially finance efforts to rebuild its military even as the blockade restricts fresh exports. That makes the tankers near Malaysia an early test of whether the administration can deliver the "total isolation" it has promised.
Treasury Secretary Scott Bessent launched Operation Economic Outcast on Sunday, promising a "zero leakage approach" designed to cut off Iran's remaining sources of revenue after months of pressure on its oil sales, shipping networks and financial enablers.
Bessent said the U.S. is "suffocating" the regime and that Iran is "not able to pay their soldiers." He warned that Iran's oil infrastructure is deteriorating, with storage rapidly filling and wells potentially shutting in "in the next week." The campaign goes beyond oil, targeting digital assets, technology, gold, aviation and shipping, while threatening broader secondary sanctions against entities that keep doing business with Tehran.
A Treasury spokesperson was blunt about what comes next: "Under Operation Economic Outcast, anyone foolish enough to continue doing business with the Iranian regime cannot continue to enjoy access to the global financial system. We will cut every remaining economic lifeline Tehran has."
The pressure campaign is showing results. China's imports of Iranian crude have fallen to an estimated 534,000 barrels per day so far this month, down from roughly 823,000 barrels per day in July, according to provisional Kpler data.
The decline suggests the blockade is making it substantially harder for Iran to export new oil. But crude already aboard shadow-fleet tankers remains a potential future source of revenue for Tehran, and analysts say more work remains.
Max Meizlish, a former Treasury official focused on sanctions policy and a senior fellow at the Foundation for Defense of Democracies, said the blockade "isn't really stopping the flow of Iranian oil that's already past the blockade line." He noted the administration has sanctioned Chinese and Hong Kong trading houses and maritime service providers accused of enabling sanctions evasion, but has stopped short of designating a Chinese financial institution.
Meizlish argued that expanding pressure on shadow-fleet vessels operating near Malaysia could help keep that oil from reaching Chinese buyers. "There's a lot more that we can do," he said.
Going after those tankers will not be simple. The U.S. Navy is already stretched by operations in the Strait of Hormuz, and seizing ships and cargo can trigger legal fights over ownership, custody and what happens to the oil afterward. Meizlish said Congress could make it easier for the government to seize illicit cargoes and suggested Washington should expand its capacity to pursue shadow-fleet vessels.
A War Department official said U.S. forces would continue "global maritime enforcement" to disrupt illicit networks and interdict sanctioned vessels supporting Iran "wherever they operate, at the time and place of our choosing."
Whether Tehran can still sell the oil sitting outside the blockade, and whether Washington is willing to go after it near Malaysia, will help determine how much "zero leakage" actually means. The administration has already shown it is willing to follow the money, and the next moves in the financial endgame against Tehran will be closely watched.
Nearly 40 million barrels of Iranian crude sit on tankers near Malaysia, beyond the U.S. blockade, testing the Trump administration's 'zero leakage' pledge to cut off Tehran's revenue.
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