RFERL:

Iran’s Supreme Leader Ayatollah Ali Khamenei said on July 21 that it would be an "obvious mistake" for officials in Tehran to negotiate with the United States because Washington is unreliable. 

"The word and even the signature of the Americans cannot be relied upon, so negotiations with America are of no avail," Khamenei’s official website quoted him as saying during a meeting with officials in Iran’s Foreign Ministry. 

Tehran has harshly criticized the decision in May of U.S. President Donald Trump to unilaterally pull the United States out of the 2015 nuclear deal between Iran and six world powers. 

During the past week, with Khamenei and other hard-liners questioning whether Tehran should continue honoring its obligations under the deal after Trump’s decision, Iran announced it is continuing to acquire uranium and is close to finishing a plant where it can build more centrifuges to enrich uranium. 

Vice President Ali Akbar Salehi, who heads the Iranian Atomic Energy Organization, said Iran will continue adhering to the nuclear deal, and that the country's stepped up nuclear activities will remain within the limits set by the accord. 

Go to link