An advisor to Iran's supreme leader Ayatollah Ali Khamenei said Friday that Tehran wants a "real and fair" agreement in talks with the US on its nuclear program this weekend in Oman.

Since 2018, when the US during Trump's first administration pulled out of a deal allowing Iran sanctions relief in return for scaling down uranium enrichment, the UN's nuclear watchdog has warned Tehran is getting close to producing nuclear fuel to produce a weapon. Iran insists its uranium enrichment is for civilian purposes.

Since taking office again in January, Trump has slapped new sanctions on the Islamic Republic, while calling for new talks on its curbing nuclear program.