I wouldn't worry 'bout it: N. Korea can NOT initiate a test that big.
No dick-head we will not negotiate with you: instead we will f#Wk you. Come on, giver your bestest shot...
Sir, we dutifullly notify you that we will stand here for a certain indiscriminate period of time. Then WE WILL PUMMLE YOU!
We will beat you so resoundedly that you will not be able to discern the next two months, 50 years, or the last four thousand years.
No we will not negotiate with you. We will negoiate with a collective party of six world-wide-entities who have an interest in the outcome of negotiations.