The thing is, is that whats his name in N. Korea could care less from the sound of it. The reason the US hasn't gone after N. Korea yet is because they boast about their Nukes and silently threaten to use one if needed.
But you know, for Iraq, diplomatic stuff never worked and Bush thought it would be nice to send in troops..oh I'll leave my comments for another thread
But if Iran started boasting it had a Nuke and would launch it at any target if the US attacked, what would Bush do? He seems hell bent on invading Iran right now.