Ayatollah Ali Khamenei’s comments will help shield Rouhani, who has sought to thaw relations with the West since his surprise election in June, from accusations of being soft on the United States, often characterized in the Islamic Republic as the “Great Satan”…

“No one should consider our negotiators as compromisers,” Khamenei said in a speech, a day before the November 4 anniversary of the 1979 seizure of the U.S. Embassy in Tehran, a pivotal event in U.S.-Iranian relations, the ISNA news agency reported.

“They have a difficult mission and no one must weaken an official who is busy with work,” said Khamenei, who wields ultimate power in Iran’s dual clerical-republic system, including over the nuclear program.