Bolton has said that he thinks the purpose of any meeting with Kim is to deliver an ultimatum to him.
Asian allies are already worried about what the Bolton appointment could mean for them:
Bolton almost certainly will use incendiary rhetoric about North Korea, but the far bigger problem is that he thinks diplomacy with Pyongyang is useless and will seek to use any meeting with Kim as a pretext for undermining it. He has said that he thinks the purpose of any meeting with Kim is to deliver an ultimatum to him:
Bolton dubs this approach “diplomatic shock and awe,” which should be a warning all by itself. Combined with the Trump administration’s past inflexibility on North Korea, that could very well be what happens. Like other hard-liners, Bolton thinks the value of meeting with an adversary is limited to demanding his surrender.
