Iran's supreme leader Ayatollah Ali Khamenei said on Tuesday he was satisfied with talks with the United States but warned they could ultimately prove fruitless.
Saturday's talks were "well carried out in the first steps", Khamenei said, quoted by state television. "Of course, we are very pessimistic about the other side, but we are optimistic about our own capabilities".
But he added that "the negotiations may or may not yield results". Khamenei said Iran's "red lines are clear", without elaborating.
Earlier Tuesday, Iran's Islamic Revolutionary Guard Corps said the country's military capabilities were off limits in the discussions.
"National security and defence and military power are among the red lines of the Islamic Republic of Iran, which cannot be discussed or negotiated under any circumstances," Guards spokesman Ali Mohammad Naini said.
In his speech, Khamenei said Iran should not pin its hopes on progress in the negotiations. AFP
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