Iran’s supreme leader said Friday that if the United States “threatens” Iran’s security, “we will threaten them in return,” adding that negotiations with America “are not intelligent, wise or honorable” after US President Donald Trump floated nuclear talks with Tehran.

“The Americans sit, redrawing the map of the world — but only on paper, as it has no basis in reality,” Ayatollah Ali Khamenei said at an Iranian Air Force event in Tehran. “They make statements about us, express opinions and issue threats. If they threaten us, we will threaten them in return. If they act on their threats, we will act on ours. If they violate the security of our nation, we will, without a doubt, respond in kind.”

Khamenei also suggested that “there should be no negotiations with such a government,” but stopped short of issuing a direct order not to engage with Washington.

Khamenei’s remarks upend months of signals from Tehran to the United States that it wants to negotiate over its rapidly advancing nuclear program in exchange for the lifting of crushing economic sanctions worth billions of dollars.

What happens next remains unclear, particularly as reformist President Masoud Pezeshkian campaigned on and promised as recently as Thursday to enter into a dialogue with the West.

Khamenei’s remarks to air force officers in Tehran appeared to contradict his own earlier remarks in August that opened the door to talks. However, the 85-year-old Khamenei has always carefully threaded his remarks about negotiating with the West. That includes balancing the demands of reformists within the country who want the talks with those of hardline elements within Iran’s theocracy, including the paramilitary Revolutionary Guard.

Khamenei noted that Trump in his previous term unilaterally withdrew from an earlier nuclear deal under which Iran drastically limited its enrichment of uranium and overall stockpile of the material, in exchange for crushing sanctions being removed.

“The Americans did not uphold their end of the deal,” Khamenei claimed. “The very person who is in office today tore up the agreement. He said he would, and he did.”