Five things to know about the upcoming ‘indirect’ US-Iran talks in Oman

As tension mounts between the US and Iran, an “indirect” meeting between envoys from Washington and Tehran is taking place in Oman on Saturday. It’s a rare diplomatic exchange between two countries that have been locked in a kind of cold war for almost half a century – and one that will unfold in the shadow of US President Donald Trump’s repeated threats of military force against the Islamic Republic.