Iran's Supreme Leader Ayatollah Ali Khamenei said he does not believe ongoing nuclear negotiations with the U.S. will yield any results, slamming U.S. demands that Tehran end its uranium enrichment program.

Iran received and is reviewing a proposal for a fifth round of nuclear talks with the United States, Deputy Foreign Minister Kazem Gharibabadi said on Tuesday, according to state media. U.S. President Donald Trump said last week that a new nuclear deal with Tehran was getting very close as the latter was provided with a proposal,