Iran condemned the U.S. for placing new sanctions on a large petrochemicals company, saying it showed that the Trump administrations recent offer to negotiate was empty.

The recent U.S. sanctions are again a clear violation of international rules and a confirmation of American economic terrorism, Foreign Ministry spokesman Abbas Mousavi was quoted as saying by the IRNA news agency on Saturday.

On Friday the Trump administration said it was imposing sanctions on Irans largest petrochemical holding group.

The administration accused it of providing support to the countrys Revolutionary Guard, a paramilitary force which the U.S. labelled as a terrorist organisation in April.

READ ALSO:Iran announces partial departure from nuclear deal

Secretary of State Mike Pompeo said this week that the U.S. was ready to talk to Iran with no preconditions in an effort to ease mounting tensions.

Mousavi said the latest sanctions undercut that overture and showed that the Trump administrations negotiating offers were absurd, empty and fraudulent.

The U.S. has been placing immense economic pressure on Iran for over a year in the form a sanctions that were reimposed as Washington abandoned the nuclear deal reached between Tehran and the international community in 2015.

Washington is seeking to renegotiate the deal, a proposition which Tehran has adamantly rejected.