WASHINGTON

The sixth round of Iran-US nuclear talks is planned for Sunday in Oman's capital Muscat, Iranian Foreign Ministry spokesperson Esmaeil Baghaei said early Tuesday.

Iran and the US resumed nuclear diplomacy in April, with Oman acting as mediator. Since then, they have held five rounds in Muscat and Rome.

While both sides have acknowledged some progress, a decisive breakthrough has yet to be achieved.

Uranium enrichment has emerged as a key sticking point in the ongoing negotiations, with the US calling for its dismantling and Iran insisting the program will continue.

Iran’s Supreme Leader Ayatollah Ali Khamenei said he does not expect talks with the US to yield results and asserted that Iran “needs no one’s permission” to enrich uranium.

US President Donald Trump has threatened military action against Iran if a new nuclear agreement is not reached to replace the 2015 nuclear deal, from which Washington withdrew in 2018.