Declaring 'economic D-day,' Trump says any country trading with Iran will be sanctioned

Trump on Wednesday declared an "ECONOMIC D-DAY" against Iran, warning that any country doing business with the Islamic Republic faces "TREMENDOUS economic consequences," as the US military reportedly helps move millions of barrels of oil through the Strait of Hormuz daily.
"These maniacs are on the ropes, and these HISTORIC MEASURES will cripple them," claims president
"ANY country that allows its financial institutions, businesses, airports or government entities to provide any type of lifeline to Iran" will face consequences, Trump said in a series of Truth Social posts Wednesday morning.
"Oil smuggling, swap lines, cash transfers, exchange houses, ship registries, front companies - It all needs to stop NOW."
"This will be an ECONOMIC D-DAY," Trump wrote.
"IRAN WILL NEVER HAVE A NUCLEAR WEAPON."
Notably, he did not describe what the actual measures are, nor name specific countries.
Treasury Secretary Scott Bessent said last week the US would ramp up economic isolation of Iran as part of a two-pronged approach with a naval blockade, calling it "economic isolation, like the world has never seen before" (Newsmax). Treasury's ongoing effort is dubbed Operation Economic Fury.
Iran struck a defiant tone after surviving months of US operations; a related ToI piece reports Iran called the floated sanctions "economic terrorism."
The war nears its sixth month with no diplomatic or military off-ramp; Hormuz remains "significantly choked off."
Trump has repeatedly made similar threats only to walk them back; he said Tuesday talks were off (floating the strait as possible "NEW US Territory"), then Wednesday said he was open to resuming them.
Axios reported US forces facilitate the transit of 15-20 ships nightly (~10 million barrels, roughly half pre-war volume); a US official said the IRGC "doesn't control the strait. We do."
The threat is ambiguous - it could sweep in allies that helped mediate peace talks. The UAE suspended all economic dealings with Iran Tuesday after two ballistic missile strikes.
Trump faces domestic scrutiny over war costs ahead of November elections; US media report munitions stockpiles are severely drawn down (denied by the Pentagon).