President Donald Trump announced Wednesday what he is calling an “Economic D-Day” against Iran, warning that any country, bank, business or government that keeps providing Tehran with an economic lifeline will face severe consequences of its own from the United States.

“Today, I am announcing the MOST CRUSHING ECONOMIC OPERATION EVER TAKEN AGAINST ANY COUNTRY!” Trump wrote on Truth Social, framing the campaign as “Economic Warfare and Isolation on an unprecedented scale.”

The president made clear the operation is not confined to Iran’s own borders. “ANY country that allows its financial institutions, businesses, airports, or government entities to provide any type of lifeline to Iran will itself face TREMENDOUS Economic Consequences,” he wrote, singling out the smuggling routes, cash transfers, exchange houses, ship registries and front companies Tehran has long used to dodge international sanctions.

“This will be an ECONOMIC D-DAY, and we need all of our Allies to stand with the United States of America to isolate, and defeat, the Iran threat.” — President Donald Trump, via Truth Social

UAE Cuts a Major Iranian Economic Lifeline

Trump’s announcement landed less than a day after the United Arab Emirates suspended financial and economic transactions with Iran, closing off one of Tehran’s most important commercial and financial gateways. The Wall Street Journal has reported that Washington had been pressing Abu Dhabi for some time to crack down on Iranian financial networks operating through Dubai, where front companies have long helped Tehran reach foreign currency and international commerce despite sanctions.

That single move may prove central to the broader strategy. Iran imports roughly $21 billion worth of goods through the UAE each year, according to Fox News, making the Emirates one of the last major economic links Tehran has left.

Washington Shifts Toward Economic Warfare

The new campaign caps weeks in which the Trump administration has leaned increasingly on financial pressure rather than a return to full-scale military operations. The Wall Street Journal has reported that the president settled on a strategy of letting sanctions and a U.S. naval blockade grind down Iran’s economy over time, and Treasury Secretary Scott Bessent foreshadowed the announcement last week, saying the administration was preparing measures unlike anything previously used to isolate a country economically.

Iranian officials have themselves acknowledged the toll. The Journal reports that blockade-driven shipping costs have risen sharply as imports are pushed onto costlier overland routes, adding further strain to an economy already under pressure.

Diplomacy Appears to Be Fading

The announcement comes as hopes for renewed negotiations have dimmed sharply. On Tuesday, Trump said there were “no talks or conversations” happening or scheduled with Tehran. Iran, for its part, continues to insist the Strait of Hormuz remains restricted, even as Trump maintains the strategic waterway is open.

Nearly six months into the conflict, it has increasingly become a contest of economic endurance — Washington squeezing Iran’s finances while Tehran leans on disruption in the Strait of Hormuz to rattle global energy markets. Oil prices reflected that uncertainty Wednesday, with Brent crude settling at $91.62 a barrel, its highest close in nearly a month.

“These maniacs are on the ropes.” — President Donald Trump, on Iran’s leadership

Trump argued Wednesday that Iran is nearing a breaking point, pointing to what he described as devastated military infrastructure, a severely weakened currency and an economy growing more isolated by the day. What comes next in his Iran strategy may hinge less on another wave of airstrikes than on whether Washington can persuade — or compel — the rest of the world to shut down the financial escape routes still keeping Tehran’s economy running.