Watch: What are the US sanctions on Iran and who else will be affected?
On Monday, US Treasury Secretary Scott Bessent, announced an "economic D-day" against Iran, with further sanctions on the regime and countries doing business with it.
Iranian Economy Minister Ali Madanizadeh said Tehran was "fully prepared" for the sanctions, which he said would lead to "another defeat" for the US.
Iranians have felt the brunt of decades of sanctions, which left its economy in tatters.
The BBC's business editor Simon Jack described Washington's move as the "financial equivalent of a military attack using money, not missiles." and explains what the last development could mean for Iran.
