Iran didn’t have a nuclear weapon before this war. But you can see why it would want one now | Simon Tisdall

If lawless aggression by ‘might is right’ nuclear-armed powers spreads unchecked, what other option do middle-ranking countries have? With every bomb dropped, ship seized and blood-curdling threat of annihilation, Donald Trump increases Iran’s incentive to reject his “grand bargain” peace deal and sprint instead to acquire nuclear weapons for future self-defence. Justifying his declaration of war on 28 February, Trump claimed that Iran – and primarily its nuclear programme – posed an “imminent threat”.