What s the Kim 's game ?

I guess Kim is using all his threats in order to blackmail the international community and the US.

He will always play the same game of "give and take".
That is his way to survive, he will make threats, than he will promise to stop it in exchange of some money, some food and the promise of not to overthrow him,
After awhile, he will start again...

What we should really do with him ?