The timing of Trump's "Fire and Fury" comment and ramping up the dangerous rhetoric I agree is suspect as a diversion.  But due to the failure of many administration's and the U.N to curb N. Korea's nuclear ambitions, this was going to inevitably end up in Trump's lap to deal with during his term.  Obama even warned him about it.  

Unfortunately, it appears that one of the most challenging and dangerous foreign policy issues of our times is going to be up to the worst leader the US has ever elected to deal with.