I certainly haven’t seen a single case of them initiating any acts that can be reasonably construed as offensive. They have been asking for negotiations for decades and all of their attempts have been rebuffed. I believe Clinton was the last more than twenty years ago to take up their offer for talks. The US has been threatening them with nuclear obliteration for many decades not only in words but in deeds. Condosleeza Rice said the US would turn the whole country into “glass” to now with the Trump admin saying they would destroy the whole country. Also the US conducts first strike nuclear bombing exercises right on their border. No country would take that without some kind of response. If it weren’t for their nukes and their display of a willingness to use them, Kim would have gone the way of Saddam or Gaddafi years ago.