U.S. Navy blockade cuts Iran's oil exports as Trump pivots to economic pressure

Iran's crude oil exports dropped to about 260,000 barrels per day in August, an 80% decline from the same month last year, according to trade-intelligence firm Kpler. The reduction follows the U.S. Navy's reinstatement of a naval blockade on July 14 in response to Iranian attacks on tankers in the Strait of Hormuz.

The blockade has involved the redirection of 75 commercial vessels, the disabling of three ships and the boarding of two, U.S. Central Command said. Kpler's commodity-research director said the blockade has "walloped Iran's crude export loadings" and that much of the oil loaded onto tankers is unlikely to pass the blockade.

U.S. officials say the strategy is part of a broader campaign of economic warfare. Treasury Secretary Scott Bessent announced a plan, dubbed "Operation Economic Outcast," to further isolate Iran financially, stating that the United States intends to impose the "toughest sanctions in history."

Analysts note that Iran still has roughly 20 million barrels of crude on tankers in Asia awaiting delivery to China and can store a similar amount onshore before capacity constraints affect production. Senior maritime-intelligence analyst Michelle Wiese Bockmann said the U.S. is assisting allied Gulf-state tankers to use a southern corridor along Oman's coast, reducing Iran's leverage over the strait.

Independent tracking firms estimate that 5-6 million barrels per day are now transiting the Hormuz corridor, about one-third of the pre-conflict flow of 15 million barrels per day.