On Sunday, President Donald Trump ordered the United States Navy to blockade all maritime traffic entering and exiting Iranian ports. On Monday at 10 a.m. Eastern Time, the blockade began. The announcement came hours after 21 hours of direct talks between Vice President JD Vance and Iranian negotiators in Islamabad collapsed without an agreement. The nuclear issue, Trump said, was the only point that really mattered. Iran would not yield.

The logic of Trump’s move is sound. Iran had turned the Strait of Hormuz into a toll booth and a siege weapon against the global economy. Trump responded by turning that same weapon into a trap. The besieger is now the besieged.

But the move, however rational, does not solve the oil problem. Not yet.

The arithmetic of the siege

Two numbers define this crisis. Iran has lost 100% of its oil export capacity. The world has lost approximately 20% of its seaborne oil supply. The question is which side breaks first under the pressure of its own number.

Iran was earning approximately $139 million per day from crude oil exports in March 2026, according to Bloomberg calculations based on export tracking data. That revenue is now zero. The Islamic Republic’s national budget depends on oil and gas for 45% of its revenue, and 47% of oil export income was allocated directly to the armed forces in the 2025-2026 budget, roughly $12.6 billion per year. In the 2025 budget bill, 51% of total oil and gas export revenues were granted to the IRGC and law enforcement. Without oil revenue, the regime cannot pay the very forces that operate the siege of Hormuz.

Iran’s accessible foreign reserves offer limited cushion. The Federal Reserve reported gross international reserves held by Iran’s central bank at $33.8 billion as of January 2025, but a significant portion of those funds are frozen in foreign banks under sanctions. Inflation........

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