U.N lately agreed to impose strict sanctions on North Korea but North Korea didn't submit to it and declared the abrogation of U.S.-North Korea's agreement on 29th Feb. The reason why they've taken a strong position against the world must be based on Kim jung un and they've wanted to strengthen his system. Besides, they said that South Korea debased Kim jung un's dignity and they'll blow up Seoul(the capital city of South Korea). Kim jung un is a moron? He seems not to realize the reality and he's just focused to his pride. I think, in the future, strong or special sanctions on North Korea might not be necessary because Kim jung un can make North Korea collapsed by himself.