The world power says N. Korea should be punished...?

We all know made in Korea textiles, household goods and toys. Can any one tell me, how many of us know N. Korea had the nuclear power station? Who gave all necessary equipments to develop this nuclear power? If the leader of this country is bad as Saddam Hussain then why was he still in power while Saddam Hussain is in custody? Why not the world famous leaders did not go to N. Korea to over throw the leader. Now this country is a threat to western world should it be punished?