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Thursday 20 August 2026 6:41 am

FTSE 100 Live: Stocks shaky as Trump threatens ‘crushing economic operation’ on Iran

By: Samuel Norman and Felix Armstrong

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Donald Trump speaking at a podium, microphone visible, discussing the Strait of Hormuz
Trump said he would claim the Strait of Hormuz as US territory. (Image: PA)

Welcome back to the Morning Wire liveblog.

Oil prices are holding over $91 as the US and Iran remain embroiled in conflict over which nation is controlling the Strait of Hormuz.

President Donald Trump has insisted oil continues to flow through the narrow waterway, even as stockpiles have depleted. Trump has said that there were no talks “going on, or scheduled” with Iran. 

Last night, the President said he would initiate the “most crushing economic operation ever taken against any country” on Iran.

In a lengthy post on Truth Social, Trump made his latest threat as he claimed Tehran “failed to take” a deal, resulting in what he called “economic warfare and isolation on an unprecedented scale”. 

“These maniacs are on the ropes,” Trump said as he described his economic measures as “historic” and having the ability to “cripple them”. 

He warned that any country providing “any type of lifeline” to Tehran would face “tremendous economic consequences”. The UAE has already announced a suspension of financial and economic transactions with Iran after accusing Tehran of launching ballistic missiles at its territory.

The 60-day ceasefire between the two US and Iran came to an end on Monday. Tehran branded a future agreement as not dead but in a “coma”.

Figures from the International Energy Agency this week showed crude inventories increased by 4.4m barrels last week, but distillate stocks declined by 1.5m barrels to their lowest level in more than a month.

We’ll be bringing you the latest market updates and analysis.

Here’s a few of our top headlines this morning

  • Monzo faces outage as thousands of users unable to make payments or transfers
  • Goldman: Junior white-collar workers squeezed hardest by AI hiring slump
  • London City 7s sign up Springbok-producing powerhouse varsity team
  • Williams turns to AI to squeeze more from F1 cost cap
  • Cut student loan repayments to get youths out of chicken shops
Read more

As it happened: FTSE 100 slump as oil soars; Trump says Iran will be ‘hit hard’ tonight

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