WASHINGTON — The confrontation between the United States and Iran is entering a potentially dangerous economic phase, with Tehran warning that any country supporting a new U.S. sanctions campaign could face retaliation and signaling that control over the Strait of Hormuz remains one of its most powerful responses.
President Donald Trump has vowed to intensify pressure on Iran's economy, while Treasury Secretary Scott Bessent has described the coming sanctions campaign as an unprecedented financial offensive. Iran, meanwhile, has warned that it would respond “in a seismic manner” and could treat countries participating in the sanctions effort as enemies.
The dispute is unfolding alongside an increasingly fragile situation in the Persian Gulf, where shipping through the Strait of Hormuz has already been severely disrupted.
Tehran threatens an economic counterattack
Iran's leadership has made clear that it does not intend to absorb additional U.S. economic pressure without attempting to retaliate.
Iran's national-security leadership has warned that sanctions will trigger a severe response and that countries cooperating with Washington could themselves become targets. The warning raises the possibility that Tehran could expand the conflict beyond direct U.S.-Iranian confrontation and pressure countries whose companies or governments continue doing business with Iran.
That threat is significant because Washington's new strategy is designed not only to punish Iran directly but also to pressure foreign businesses and governments that continue maintaining economic links with Tehran.
The result could be a widening economic confrontation involving some of Iran's most important trading partners.
Hormuz is Iran's biggest economic lever
The Strait of Hormuz remains at the center of the dispute.
The narrow waterway connects the Persian Gulf with the Gulf of Oman and is one of the world's most important energy corridors. Any sustained disruption can affect oil and gas supplies well beyond the Middle East.
Iran has increasingly used maritime restrictions as leverage. On Monday, Iranian authorities threatened dozens of tankers with fines, detention or cargo confiscation for allegedly violating Iranian transit rules. Reuters reported that 45 vessels were placed on a blacklist.
The move demonstrates how Tehran can use regulatory and maritime pressure without necessarily announcing an outright closure of the waterway.
That distinction matters.
A complete closure would represent an extraordinary escalation, potentially provoking a major military response. But selective restrictions, inspections, blacklisting and threats against shipping companies can still make the waterway considerably more difficult and expensive to use.
Iran could target Gulf oil exports
The most serious concern is that Iran could attempt to prevent oil from leaving the Persian Gulf altogether.
Iran has threatened to block Gulf oil exports if Washington continues escalating its economic campaign. Analysts warn that such a step could dramatically increase energy prices and create another shock for the global economy.
The threat is particularly important because the Persian Gulf supplies a large share of the world's energy needs.
Even a partial interruption could force oil buyers to compete for alternative supplies, raise transportation costs and increase pressure on economies that depend heavily on imported energy.
Asian economies would be particularly exposed because many major Gulf energy exporters rely on routes through Hormuz to reach customers in Asia.
Washington prepares “economic D-Day”
The Trump administration is moving in the opposite direction.
Bessent has warned of an “economic D-Day” as Washington prepares additional sanctions designed to sever Iran's remaining economic lifelines.
The strategy reportedly includes secondary sanctions that could punish foreign companies and countries continuing to conduct business with Tehran. That approach could place major trading partners in an increasingly difficult position: comply with Washington and risk losing access to the U.S. financial system, or continue dealing with Iran and risk American penalties.
The policy is intended to make Iran's economic isolation much more comprehensive.
But it also creates a significant risk of retaliation.
China and other countries face pressure
The sanctions campaign could become especially complicated if major countries refuse to cooperate.
China has criticized unilateral U.S. sanctions and warned that increasing economic pressure could worsen the crisis. Beijing remains an important economic partner for Iran, making Chinese cooperation one of the most consequential questions surrounding Washington's strategy.
Other countries also face difficult choices.
Iran has specifically warned that governments supporting the American sanctions effort could be treated as participating in an act of war. That language increases the diplomatic stakes and could complicate efforts by countries attempting to maintain neutrality.
Iran's economy is already under enormous pressure
Tehran's threats come as its domestic economic situation deteriorates.
Iran's currency reportedly fell to a historic low on Monday, with the rial reaching roughly 2.02 million to the U.S. dollar on the open market. Inflation has also surged, with prices for staple foods increasing dramatically since the conflict began.
The economic pressure creates a difficult calculation for Iran's leadership.
On one hand, Tehran needs access to international trade and energy revenue. On the other, Iranian officials may believe that control over Hormuz gives them enough leverage to make further pressure on Iran costly for the United States and its allies.
That creates a dangerous cycle: Washington increases economic pressure to weaken Tehran, while Tehran threatens measures that could impose substantial costs on the global economy.
Shipping companies are already feeling the pressure
The uncertainty surrounding Hormuz has dramatically changed shipping conditions.
Reuters reported that Iran's latest blacklist includes vessels associated with major shipping companies and energy firms. Tehran has warned that vessels conducting ship-to-ship transfers with blacklisted ships could also face penalties.
For shipping companies, uncertainty itself can become a major cost.
Operators must consider whether vessels can safely enter the waterway, whether they could be detained, whether insurance premiums will rise and whether cargoes can reach their destinations.
Even without a formal blockade, those risks can discourage commercial traffic.
The threat goes beyond oil
Hormuz is not only about crude oil.
The region is also critical for liquefied natural gas shipments and other energy products. A prolonged disruption could therefore affect electricity generation, transportation costs, manufacturing and household energy bills in countries far from the battlefield.
The economic consequences could spread through several channels simultaneously.
Higher energy prices can raise transportation and production costs. Businesses may pass those expenses to consumers, contributing to inflation. Central banks could then face pressure to keep interest rates higher for longer.
That is why markets are watching the Iran-Hormuz confrontation so closely.
A dangerous escalation cycle
The central concern now is whether economic pressure produces negotiations or escalation.
The Trump administration appears to believe that increasingly severe sanctions can force Iran to accept a settlement by making the cost of continued confrontation unbearable.
Tehran, however, appears determined to demonstrate that it can impose costs of its own.
The result is a contest of economic endurance.
Washington has greater access to global financial infrastructure, while Iran has geographic control over one of the world's most important maritime chokepoints.
Neither advantage is unlimited.
What happens if Trump escalates further?
If Washington moves beyond sanctions toward additional military action, Iran could respond through several channels.
The most immediate concern would be further restrictions on shipping through Hormuz. Tehran could also attempt to increase pressure on countries cooperating with Washington, while Iran-aligned groups elsewhere in the region could create additional security risks.
At the same time, Iran must consider the consequences of going too far.
A complete closure of Hormuz or attacks on commercial shipping could trigger a much broader military response and potentially alienate countries that currently oppose American sanctions but do not want to become directly involved in the war.
That makes Tehran's threats both powerful and risky.
The stakes are global
The latest confrontation demonstrates why the Iran conflict is no longer simply a regional military dispute.
It has become an international economic confrontation involving oil markets, shipping companies, financial institutions and governments across Asia, Europe and the Middle East.
Iran's reported strategy is straightforward: if Washington attempts to impose an economic stranglehold, Tehran can try to make the economic consequences painful for everyone else.
Trump's administration, meanwhile, is betting that Iran cannot withstand sustained financial pressure indefinitely.
The next stage of the conflict may therefore be determined not only by missiles and military operations, but by which side can withstand the economic pressure longer.
For now, the Strait of Hormuz remains the critical pressure point. Iran's threats against shipping and Gulf oil exports demonstrate that Tehran still possesses a powerful lever, while Washington's expanding sanctions campaign shows that the United States intends to use its own economic power to maximum effect.
The danger is that a strategy designed to force an opponent to back down can instead produce retaliation — turning an economic confrontation into an even wider regional crisis.
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