A ceasefire "hanging by a thread". A diplomatic process "making progress". A president "not satisfied". And explosions echoing around the Gulf. What to make of the current, confusing state of relations between the US and Iran - are we close to peace or sliding back to war? This week has certainly tested the ceasefire, which came into effect on 8 April and has now lasted considerably longer than the active phase of fighting which preceded it. Iran responded to the latest US strikes - which