I think war with N. Korea in the near future is highly likely.
Kim seems to be a crazy, paranoid meglomaniac. Trump doesn't seem overly attached to diplomacy either.
The problem--in my mind--is that everyone seems focused on his nukes, and there doesn't seem as much attention given to his chemical and biological weapons...like weaponized anthrax and large amounts of VX nerve gas--or, God help us--Novichock agents.
He used VX to kill his own brother, so I don't see him exercising a lot of restraint in a military confrontation.
He's crazy and dangerous, and he needs to disappear.
If that little warped penguin chooses to use WMDs so be it, he just opened up the gates of hell and if he doesn't know he soon will given he is one of the primary targets in an airstrike.
US Military doctrine
If NK or any state uses Chemical weapons (WMD) to attacks on US Forces, it's allies and civilian population the US reserves the right to use nuclear weapons even if the state possesses no nuclear weapons
Field commanders can request permission to use nuclear weapons:
An enemy using or threatening to use WMD against US, multinational, or alliance forces or civilian populations.
To prevent an imminent biological attack.
To attack enemy WMD or its deep hardened bunkers containing WMD that could be used to target US or its allies.
To stop potentially overwhelming conventional enemy forces.
To rapidly end a war on favorable US terms.
To ensure US and international operations are successful.
To show US intent and capability to use nuclear weapons to deter the enemy from using WMDs.
To react to enemy-supplied WMD use by proxies against the US and international forces or civilians.