It takes "two to tango"
As long as Kim Jong Un (and his father and grandfather) threatened, but other countries refused to be intimidated or provoked to respond to the threats, the danger was reduced.  But with Trump deliberately and systematically provoking and insulting Kim the danger of deliberate, accidental or irrational nuclear incidents occurring is vey greatly increased.  
By the way, a recent article in the Albuquerque Journal has an interview with the new head of the Sandia Labs in Albuquerque, NM.  He sounds as if they are definitely planning to renovate the nuclear delivery systems--that it will be a main focus.