Trump said Thursday he would be willing to reopen talks as long as Iran agreed to give up nuclear weapons. But Tehran ruled out talks until the United States is ready to "return to normal."

Mousavi called the new sanctions another instance of "economic terrorism" and a continuation of US "enmity" against Iran.

"America's maximum pressure policy is a failed policy tried numerous times before by the country's previous presidents. This a wrong path and the US government can be sure that it will not achieve any of the goals set for this policy," Mousavi added.

Washington began reimposing unilateral sanctions on Iran after Trump abandoned a landmark 2015 nuclear deal in May last year.

It reimposed a first set in August followed by a second in November.

On April 8, it designated Iran's Revolutionary Guards a "foreign terrorist organisation", paving the way for sanctions against their sources of funding.

Announcing the sanctions against PGPIC on Friday, US Treasury Secretary Steven Mnuchin said they were intended as a "warning that we will continue to target holding groups and companies in the petrochemical sector and elsewhere that provide financial lifelines to the Islamic Revolutionary Guard Corp."

The PGPIC group holds 40 percent of Iran's petrochemical production capacity and is responsible for 50 percent of the its petrochemical exports, Treasury said.