Iran and the U.S., holding talks in Rome, will have experts meet to discuss details of a possible deal over Tehran's rapidly advancing nuclear program, Iran's top diplomat says.

American and Iranian officials have begun their second round of indirect nuclear talks in Rome as the Trump administration weighs diplomacy against possible military action.

That the talks are even happening represents a historic moment, given the decades of enmity between the two countries since the 1979 Islamic Revolution and the U.S. Embassy hostage crisis.