"Fake News Reports that the Islamic Republic of Iran, and the U.S.A., stopped speaking a few days ago are false and erroneous," Trump wrote on his Truth Social network.
Rising fuel prices linked to the Iran conflict have pushed Kenya’s inflation to a 16-month high.
The United States and Iran said Monday they had again traded strikes, straining an already fragile ceasefire as negotiations between the two sides have stalled.
US President Donald Trump said he had secured guarantees from Iran that it would not develop nuclear weapons, as reports emerged he had sent a tougher peace proposal back to Tehran.
A report from Iran's Fars news agency also rebutted several key elements of Trump's characterization of the deal, citing informed sources as calling his remarks a "mixture of truth and lies".
"It's hard to say exactly when or if the President is going to sign the MOU. We're going back and forth on a couple of language points. We've made a lot of progress here," Vance told reporters.