Iran and the United States have begun a fourth round of negotiations over Tehran’s rapidly advancing nuclear program.

An Iranian official told CNN that recent indirect talks with the United States aimed at addressing Tehran’s nuclear program ...

Tehran called Sunday’s meeting “difficult but useful” as the two sides clash over future of Iran’s uranium enrichment.

The talks seek to limit Iran’s nuclear program in exchange for the lifting of some of the crushing economic sanctions the U.S ...

Fourth round of talks between Iran and the US over Tehran's nuclear program begins in Oman, Iranian state media reports.