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International Relations23 Oct 2026 · about 6 min

Iran under mounting oil pressure: Will Tehran hit back over US blockade?

The brief

A naval blockade is a military effort to prevent ships from entering or leaving a country’s ports or carrying prohibited goods. In this case, the United States used maritime forces to restrict Iran’s oil shipments. The goal, according to the article, was to limit Tehran’s oil revenue and increase financial pressure on its government. Iran initially sold oil that had already passed through the Strait of Hormuz and remained aboard tankers in international waters. Those shipments allowed exports to continue temporarily, even after the blockade began. US Central Command later said the blockade had prevented at least $25 billion in crude oil exports over 100 days. The blockade matters because Iran relies heavily on oil income to pay for imports. Once floating oil reserves were depleted, Tehran faced a sharper loss of revenue. The article suggests this pressure could push Iran to intensify efforts to challenge or break the blockade, while the United States continues enforcing its restrictions.

01

What is a naval blockade, and how has the United States used it to restrict Iran’s oil exports?

A naval blockade is a military effort to prevent ships from entering or leaving a country’s ports or carrying prohibited goods. In this case, the United States used maritime forces to restrict Iran’s oil shipments. The goal, according to the article, was to limit Tehran’s oil revenue and increase financial pressure on its government.

Iran initially sold oil that had already passed through the Strait of Hormuz and remained aboard tankers in international waters. Those shipments allowed exports to continue temporarily, even after the blockade began. US Central Command later said the blockade had prevented at least $25 billion in crude oil exports over 100 days.

The blockade matters because Iran relies heavily on oil income to pay for imports. Once floating oil reserves were depleted, Tehran faced a sharper loss of revenue. The article suggests this pressure could push Iran to intensify efforts to challenge or break the blockade, while the United States continues enforcing its restrictions.

02

How much Iranian oil revenue has the blockade reportedly prevented, and how does that compare with the roughly $350 million in Iranian cryptocurrency that was frozen?

US Central Command said the maritime blockade prevented Iran from exporting at least $25 billion worth of crude oil over 100 days. That figure represents revenue Iran could no longer obtain from selling oil. The article presents this loss as the main source of financial pressure on Tehran.

Washington also froze around $350 million in Iranian cryptocurrency. Comparing the figures, $25 billion is roughly 71 times larger than $350 million. The frozen cryptocurrency is therefore significant, but it is much smaller than the oil income blocked by the naval operation.

Former US Treasury official Miad Maleki said the loss of oil revenue posed the greater challenge. Cryptocurrency can affect Iran’s ability to move money, but it cannot replace the scale of oil earnings described in the article. The larger problem is Iran’s reduced access to funds for imports and transportation.

03

What happens to Iran’s ability to pay for imports when it can no longer sell enough oil?

Oil revenue gives Iran money to purchase goods from abroad and cover the costs of bringing them into the country. When the blockade reduces those earnings, Tehran loses the income it previously relied on to finance imports. The immediate effect may be limited because some goods entering Iran were paid for earlier.

Other imports can still arrive through land routes, according to Miad Maleki. But those supplies do not remove the underlying financial problem. Iran must eventually pay for new purchases and transportation. Without sufficient oil revenue, it may lack the funds needed to keep those flows moving.

Maleki said the situation would become much more difficult when Iran could no longer pay for goods and transport costs. The article does not determine exactly how quickly that point will arrive. It does show that depleted oil income makes future imports increasingly vulnerable.

04

Why did Iran’s oil exports continue temporarily after the blockade began, and why did those floating oil reserves eventually run out?

Iran’s oil exports did not stop immediately because the blockade began after some shipments had already passed through the Strait of Hormuz. That oil remained on tankers in international waters. Iran could therefore continue selling and delivering those cargoes even while new maritime exports were restricted.

This created a temporary stock of oil at sea. The tankers functioned as floating reserves, allowing Iran to keep discharging previously shipped crude. However, the supply was finite. It could be sold only until the tankers’ cargoes were delivered and no replacement shipments reached international waters.

Commodity-data firm Kpler reported that the floating reserves were depleted by mid-October. Its head of crude oil analysis, Homayoun Falakshahi, said there was no more oil to discharge to China. The episode shows why the blockade’s full financial effect appeared after existing shipments were exhausted.

05

Why can cryptocurrency provide only a limited alternative to oil revenue for Iran?

Cryptocurrency offers Iran a way to move or hold funds outside ordinary financial channels. That makes it a possible workaround when sanctions or blockades restrict access to conventional payments. However, the article describes cryptocurrency as only a limited alternative to oil revenue, not a replacement for it.

The clearest comparison is financial scale. Washington froze around $350 million in Iranian cryptocurrency, while the blockade reportedly prevented at least $25 billion in oil exports over 100 days. The blocked oil figure is roughly 71 times larger. Oil sales therefore represent a much broader source of money for Iran.

Cryptocurrency also does not solve the central problem of earning enough revenue from exports. It may help move some funds, but it cannot restore the oil income lost when tankers cannot deliver new cargoes. Maleki consequently identified the loss of oil revenue as Tehran’s greater financial challenge.

06

What options do Iran and the United States have for enforcing or challenging the blockade, and why might Tehran try to break it?

The article presents a direct conflict over access to oil revenue. The United States is using a maritime blockade and restrictions to prevent Iranian oil exports. Iran, facing a growing shortage of funds, may intensify efforts to break or challenge that blockade because its ability to finance imports is weakening.

The article does not specify the military or legal options available to either side. In general terms, the United States could continue patrolling and enforcing the maritime restriction, while Iran could seek to challenge the blockade or find alternative routes for trade. Those possibilities are broader context, not tactics described in the article.

Tehran’s incentive is clear from the reported figures. The blockade prevented at least $25 billion in oil exports over 100 days, while floating reserves have run out. If Iran cannot restore oil income, paying for new goods and transportation could become increasingly difficult.

07

Why is oil revenue so important to an oil-exporting country’s economy, and how do oil sales become money for imports and government spending?

Oil revenue matters because selling crude converts an underground resource into funds that an oil-exporting country can use. Governments and businesses can use those funds to buy goods from abroad, pay transportation costs, and support public finances. The article specifically links Iran’s oil income to financing imports.

The basic mechanism is straightforward. Iran sells oil to overseas buyers, receives payment, and uses that money to purchase goods and cover the costs of bringing them into the country. When shipments are blocked, the sales and payments decline. Existing imports may continue briefly because some goods were paid for earlier or arrive by land.

The longer-term problem appears when Iran must finance new purchases without its usual oil earnings. Former Treasury official Miad Maleki said that point would make conditions much more difficult. The article does not list every category of government spending, but it clearly identifies imports and transport as key uses of oil revenue.

This brief was written by AI from the original reporting and checked by other models. Names, figures and quotes come from the source; read it for full context.

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