Iran's Supreme Leader, Mojtaba Khamenei, is in hiding in an undisclosed location. Assassination fears have forced him to use secret couriers. This is slowing down crucial talks with the US. Other senior Iranian officials are also staying underground. Communication challenges are causing frustration among leaders.

Officials at the highest levels of the Iranian government say they don't know where Mojtaba Khamenei is and have no way to contact him directly, relying instead on a network of…

Officials said the difficulty in reaching Khamenei “means there can be a long delay before the U.S. receives a response” after it sends proposed details.