US President Donald Trump threatens economic sanctions to countries trading with Iran
U.S President Donald Trump posted on Truth Social declaring an “ECONOMIC D-DAY” against Iran and warning that any country providing it a “lifeline” would face severe economic consequences.
Key points from the announcement
Trump said Iran had “failed to take” opportunities for a deal and that the U.S. would pursue “the MOST CRUSHING ECONOMIC OPERATION EVER TAKEN AGAINST ANY COUNTRY” involving “Economic Warfare and Isolation on an unprecedented scale."
He specifically stated:
“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 called for an immediate end to activities including “Oil smuggling, swap lines, cash transfers, exchange houses, ship registries, front companies,” adding “You know who you are,” and urged U.S. allies to join in isolating Iran.
No specific new measures, timelines, targeted countries, or legal mechanisms were detailed in the post. The White House and Treasury have not yet provided further clarification in initial reporting.
Context
This comes amid a prolonged U.S.-Israel conflict with Iran that began around late February 2026, following earlier diplomatic efforts, including a June 2026 memorandum of understanding and temporary sanctions relief that appears to have expired or been walked back.
The U.S. has already pursued secondary sanctions and other economic pressure, sometimes referred to as “Operation Economic Fury”, and the UAE recently announced it was suspending trade and financial ties with Iran.
China is Iran’s largest oil buyer, purchasing the large majority of its seaborne crude in recent data.
Other significant partners have included Turkey, Iraq, the UAE, India, among others. Earlier in 2026 (January–February), Trump had threatened a 25% tariff on countries trading with Iran and signed a related executive order authorizing additional duties, though full implementation details and enforcement varied.
Analysts note that secondary sanctions or tariffs targeting major trading partners (especially China) would carry significant risks of escalation or retaliation, and Iran has long adapted to heavy U.S. sanctions through workarounds. Iranian officials have dismissed the latest threats as diversionary.

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