Clinton tried to appease them, Bush saw the futility in dealing with them and now Obama thinks the U.N. can help. North Korea hasn’t  existed this long without finding ways to get around numerous U.N. resolutions, embargoes, sanctions and restrictions. Otherwise, they wouldn’t be testing missiles and have enough nuclear material to detonate. Nothing can be done militarily to stop North Korea, especially by the United States. North Korean officials know this and telling them that the international community doesn’t like it is really breaking their hearts [Article - World powerless to stop North Korea].