It's also not enough to have ICBMs, they have already credibly tested those years ago, they want so many ICBMs that the US feels threatened by it (this is what deterrence means in practice), but not so many the US decides it has to do anything about it.
> Every Pyongyang district, particularly where the North Korean leadership is possibly hidden, will be completely destroyed by ballistic missiles and high-explosive shells as soon as the North shows any signs of using a nuclear weapon.
For the DPRK the official strategy is not known as far as I know, but in 2022 they passed a new law explicitly authorising preventive nuclear strikes if "it is judged" that ROK is going to strike state leadership. See https://www.apln.network/analysis/commentaries/north-koreas-... which also links to a janky translation of the law.
Edit: Just to clarify...I mean the distance between both is so short, a Nuclear War is absurd. There is no way to Nuke one country, without making your own country a radiation fallout zone.