The source said that, following a proposal from Oman’s Foreign Minister to hold the fourth round of negotiations on Sunday, Tehran has agreed to the arrangement.
So far, three rounds of negotiations have taken place: two rounds in Muscat, Oman, and one in Rome, Italy.
The fourth round, initially scheduled for Saturday, was postponed.
Iran has emphasized that it is only willing to discuss its nuclear program and the removal of sanctions. Tehran has also declared its readiness to reassure the international community that its nuclear program is purely peaceful.