It isn't clear whether the two month-clock begins from the time the letter was delivered or from when negotiations start.

Trump's claim he struck a deal with Putin to stop Iran from 'destroying' Israel comes after bombing by the US of Iran's ...

Trump has the leverage to demand disarmament, not merely arms control.

Iran's Supreme Leader, Ayatollah Ali Khamenei, appeared to reject the idea of talks with a "bullying" US. So too - publicly - ...

Almost a decade after its historic deal with world powers, Iran is closer than ever to being able to make a nuclear bomb.