Yesterday they declared they were to start Nuclear testing again in order to secure it's self against US hostilities.

I really cannot understand how this will help. As I am aware the US isnt threatening them in any Military sense just through embargos. Surely this has just threatened their security more. Although there is the trouble in the Mid East to me this nuclear issue looks far more serious. The whole world is against this action (not sure where the chinese really stand though) so why are they persuing it.