Iran and the United States are set to attend a fourth round of talks over Iran's nuclear programme, as US officials have voiced increasing opposition to Iranian enrichment.

Iranian FM Abbas Araghchi declares that Tehran would never give up its nuclear rights if US talks aimed to restrict them. His remarks come on the eve of new nuclear negotiations in Oman.

Iranian Foreign Minister Abbas Araqchi said on Saturday that if the United States' goal is to deprive Iran of its "nuclear rights", Tehran will never back down over those rights.