i am sure that China would be as pleased to have N Korea as an American satellite on its' border, as Russia is with Georgia.
The treaty to supply NK with energy met the same fate as all the other American treaties (maybe they have heard of Wounded Knee) so they re-started their own energy supply.
The concept of USA starting another shooting war (in the Far East !!!) while they are enjoying such huge success in the Middle East is hilarious.
NK is saying "failure to live up to your agreements, has consequences".