Have US-Iran talks failed? Why no deal yet doesn’t mean diplomacy is dead

Tensions between the United States and Iran have reached another critical juncture. While a fragile ceasefire is holding, efforts to translate the nearly three-week truce into a permanent agreement appear to have stalled.

Hopes of talks in the Pakistani capital, Islamabad, over the weekend dissipated after US President Donald Trump cancelled a visit by his envoys as both Iran and the US remain s...