MUSCAT: Iran and the United States are set to attend a fourth round of talks over Tehran’s nuclear program on Sunday, as US officials have voiced increasing opposition to Iranian enrichment.
The negotiations, mediated by Oman and held in its capital Muscat, follow earlier rounds that began nearly a month ago, marking the highest-level contact between the two foes since Washington withdrew from a landmark nuclear deal in 2018, during President Donald Trump’s first term.
Both sides have reported progress after previous talks, but there have been some delays and disagreements over Iran’s right to enrich uranium, which Tehran says is “non-negotiable” but a US envoy has called a “red line.”
Iran’s Foreign Minister Abbas Araghchi said ahead of Sunday’s meeting that “the negotiations are progressing and, naturally, the further we go, the more consultations and considerations we need” and the more time is required “to review the issues raised.”
The fourth round was initially set to take place on May 3 but has been rescheduled. Mediator Oman cited “logistical reasons” for the delay, which was announced after the United States had imposed new sanctions on Iran.
Western countries, including the United States, have long accused Iran of seeking to acquire atomic weapons, a claim Tehran has consistently denied, insisting that its nuclear program is for peaceful purposes.
Iran currently enriches uranium to 60-percent purity — far above the 3.67-percent limit set in the 2015 deal with the United States and other world powers, but below the 90 percent needed for weapons-grade material.
US Middle East envoy Steve Witkoff, who has led Washington’s delegation to the Omani-mediated talks, said in a Friday interview that Iran’s “enrichment facilities have to be dismantled.”
“That’s our red line. No enrichment,” he told US right-wing outlet Breitbart News, after initially suggesting flexibility on Tehran maintaining low-level enrichment of uranium for civilian purposes.
Witkoff said that if the talks “are not productive... they won’t continue and we’ll have to take a different route.”
Trump has said he wanted “total verification” that Iran’s contested nuclear work is shut down, and Secretary of State Marco Rubio has insisted that Tehran give up all uranium enrichment.
Araghchi, Tehran’s chief negotiator in previous rounds, has repeatedly defended Iran’s right to enrich uranium.

NUCLEAR DEAL
Iran adhered to the 2015 agreement for a year after Washington’s withdrawal before beginning to roll back its compliance.
Since returning to office in January, Trump has revived his “maximum pressure” approach against Tehran, while backing nuclear diplomacy but warning of potential military action if it fails.
The talks are taking place amid renewed scrutiny of key aspects of Tehran’s nuclear program, particularly its stockpile of enriched uranium and the pace of its enrichment activities.
European governments are weighing whether to trigger the “snapback” mechanism under the 2015 deal, which would reinstate UN sanctions in response to Iranian non-compliance — an option that expires in October.
Israel’s Prime Minister Benjamin Netanyahu, who opposes the Iran-US talks, has called for Tehran’s nuclear facilities to be dismantled and for its ballistic missile program to be stopped as part of any credible deal.
Tehran has insisted that the talks be solely focused on the nuclear issue and the lifting of sanctions, ruling out negotiations on military capabilities.
Foreign ministry spokesman Esmaeil Baqaei said that Iran’s delegation “consists of the experts and specialists needed at this stage of the talks, serving the highest interests of our country.”
Sunday’s meeting comes days ahead of a regional tour by Trump, which will take him to Qatar, the United Arab Emirates and Saudi Arabia.