By bnm Tehran bureau The United States and Iran agreed to move forward with nuclear talks following direct and indirect discussions in Muscat on May 11, sources close to negotiations said, citing a senior US administration official.

Top Iranian and U.S. negotiators resumed talks on Sunday to address disputes over Tehran's nuclear programme, Iranian state media reported, in a push for progress as Washington hardens its stance ahead of U.

Iran and the United States kicked off the fourth round of nuclear talks in Oman Sunday amid a standoff over uranium enrichment, with Tehran calling it "non-negotiable", while Washington has described it as a "red line".