I fully expect the US to at least engage in a nuclear counterforce strike when one of their carrier groups is hit by a nuke.
But I seriously doubt the US would initiate this kind of response before a weapon hits and they are certain it is a nuke. A cruise/anti-ship missile as well as a torpedo or a bomb could just as well contain a nuke and one doesn't start a nuclear exchange just for the chance of a single asset (like a CVBG) being targeted with a nuke. This is not a massive first strike armed at your population and/or nuclear forces where it is about launching or loosing one's own nukes.
As for reminding the world. I thought that Matti's response was of the right kind.
Agreed, IMO the new UN Sanctions, approved 15-0, will result in the desired Effect on the DPRK/Kim. CHINA seems to be more willing in the recent days to also mitigate the DPRK brinkmanship. Ideally all sides want to keep,this from getting kinetic.
If the sanctions fail, why not consider a Naval style blockade?
- Allow humanitarian shipments in only
- Nothing is exported
- get UN backing
- force The PLA to make a decision
--close the land border and look like they're helping the peaceful settlement
--lose face and political capital by supporting the DPRK
-its summer there, no worries about cold for the civilian popufor now
-if the DPKR shoots first at an Allied naval vessel
-limit allied response to that vessel(S) only
- do not escalate(as the DPRK may wish)
Be prepared for a negotiated settlement disarming the DPRK
-consider a "nuke free" zone in the peninsula