Economic Siege: Can Sanctions Outlast Iran's Defiance?

The Strait of Hormuz Is the Real Target

When President Trump vowed a swift victory in February, the goal was Iran’s nuclear program. Six months of bombing and a failed ceasefire deadline have shifted that objective. The new aim is prying the Strait of Hormuz out of Tehran’s grip—a chokepoint that carries about 20% of global oil and where Iran has demonstrated it can inflict asymmetric pain.

Economic warfare is now the primary instrument. Treasury Secretary Scott Bessent unveiled a campaign Monday to “sever every economic lifeline that sustains this tyrannical regime until Tehran stands alone.” The message to countries still trading with Iran is blunt: you share in the isolation of a withering regime.

But maximum pressure has a long history in US-Iran relations. Each round of sanctions has been met with escalation, not capitulation. The non-obvious implication of this latest push is that it may reinforce the very behavior it seeks to stop: Iran will likely respond with more aggressive regional targeting, not less.

The Anatomy of a Sanctions State

Iran’s economy has survived decades of punishment by weaving alternative trade routes. The Islamic Revolutionary Guard Corps built a shadow network that moves goods through third countries, re-flags vessels, and exploits financial loopholes. When the US sanctioned Iraq and Venezuela, Iran used those channels. When direct shipping became risky, cargo was transshipped through Oman, the UAE, and Turkey.

The United Arab Emirates was the biggest importer of Iranian goods at roughly $21 billion in 2024. Now it has halted all trade and financial transactions with Tehran. That’s a significant blow—but not a death sentence. It signals that regional states are willing to distance themselves from Iran after Tehran’s retaliatory missiles struck US bases in the Gulf. Yet it also reveals the transactional nature of this isolation: when the guns fall silent, trade likely resumes.

The real test is China. In 2025, Beijing purchased an estimated $31 billion in crude oil from Iran, accounting for nearly 45% of Iran’s government budget. Secretary Bessent said July data showed those imports had plunged by about 40% due to the US naval blockade. But China has tapped its oil reserves, and its foreign ministry called unilateral sanctions counterproductive.

If Washington penalizes Chinese entities for continuing trade, it risks severing its own détente with Beijing. If it doesn’t, Iran retains its most critical lifeline. Either outcome exposes the limits of US sanction power: it can disrupt, but not fully sever, a nation willing to absorb the cost.

The Human Arithmetic of Strangulation

Inside Iran, the arithmetic is already brutal. A 40-year-old baker in Tehran described a neighbor whose father with cancer cannot receive chemotherapy because hospitals lack working equipment. She said her own bank account was blocked, with nearly $1,000 missing. Her weekly groceries—laundry detergent, rice, milk, lentils, pasta, sanitary pads—cost about $30 against a monthly minimum wage of roughly $100.

These are not abstractions. They are the metrics of a population already living under sanctions for years and now subjected to a naval blockade that has tripled shipping costs from $3,000 to $12,000 per container. Majid-Reza Hariri, head of the Iran-China Chamber of Commerce, told Khabar Online that the blockade is worse than the war.

Yet economic pain does not automatically translate into political surrender. It often hardens resolve. The regime’s calculus is simple: capitulate and risk internal collapse, or resist and externalize the blame. Iranian security chief Mohsen Rezaei warned on state television that Iran would retaliate in a “seismic manner” against any country joining the economic war, targeting tankers on alternate routes so “not even a single drop of oil will leave from the region.”

The Mutually Assured Economic Destruction

What we are witnessing is a race in who blinks first. The US believes financial strangulation can break the regime. Iran believes its ability to disrupt regional trade can make the cost unbearable for Washington and its allies. Both sides are correct, and both are wrong.

The blockade is damaging Iran’s economy. The sanctions campaign is squeezing its revenue streams. But the regime has survived worse. Its resilience is built on the doctrine that sacrifice is preferable to submission. And it holds cards of its own: the threat to close the Strait of Hormuz, to attack Gulf infrastructure, to destabilize the region further.

Esfandyar Batmanghelidj of the Bourse & Bazaar Foundation noted that maximum pressure tends to generate maximum resistance. The likely outcome is not a surrendered Tehran but an emboldened one, using the leverage it still possesses to ensure that what Iran has endured for decades does not become the model for the future.

What Happens Next

The path ahead has two diverging branches. If China cooperates under US pressure, Iran’s budget will contract severely, but the regime may double down on asymmetric threats. If China refuses, the US faces a choice: escalate sanctions against Beijing and risk a broader economic confrontation, or accept a partial blockade and hope attrition works.

Either way, the Strait of Hormuz remains the focal point. Iran has already demonstrated it can disrupt shipping. The US and its allies have shown they can interdict it. The question is whether economic warfare can achieve what airstrikes and diplomacy could not: forcing Iran to accept constraints on its regional behavior without triggering a wider war.

History suggests that sanctions alone are insufficient. They can cripple, but they rarely compel regime change in a state that has institutionalized resistance. What might work is a calibrated combination of pressure and off-ramps—something the current campaign has yet to clearly offer.

For now, the economic siege is underway. The human cost inside Iran is rising. The regional stakes are escalating. And the United States is betting that financial pressure can replace military victory. The bet is not impossible, but it carries a high risk of backfire: a regime more determined than ever to prove it cannot be broken.