TEHRAN, April 15 -- Iran's foreign minister is to visit ally Russia this week to discuss nuclear negotiations with the United States, ahead of a new round of talks between the foes planned for Rome.

On Saturday, Abbas Araghchi held talks with US Middle East envoy Steve Witkoff in Oman-the highest-level negotiations since the 2015 nuclear accord collapsed.

US President Donald Trump, who withdrew from the deal, has brought Iran back into the spotlight since returning to office in January.

In March, he sent a letter to Iran's supreme leader Ayatollah Ali Khamenei, calling for nuclear talks and warning of possible military action if Tehran refused.

Western countries, including the United States, have long suspected Iran of pursuing nuclea...