Iranian officials have urged Supreme Leader Ayatollah Ali Khamenei to negotiate with the US on nuclear talks, warning that a failure to do so could result in US military strikes on two nuclear sites. Khamenei eventually granted permission for talks, which will begin as indirect negotiations through an intermediary and then evolve into direct talks. The talks come amid warnings that a war with the US or Israel, as well as Iran's economic crisis, could lead to the fall of the regime. The talks in Oman will be mediated by Omani officials, with messages being delivered between the two sides.