Iran's Supreme Leader Ayatollah Ali Khamenei said U.S. demands that Tehran stop enriching uranium are "excessive and outrageous", state media reported, voicing doubts whether talks on a new nuclear deal will succeed.

"We don't think it will lead to any outcome," the supreme leader warns, saying the US is making "outrageous" demands on uranium enrichment.

Iran’s Supreme Leader Ayatollah Ali Khamenei said he does not expect negotiations with the United States over Tehran’s nuclear program to “reach a conclusion” as Washington toughens its conditions for a deal.