Another good article from WOR:
https://warontherocks.com/2017/08/deterring-north-korea-the-next-nuclear-tailoring-agenda/
Just my two cents but in this one particular security threat to the world, our nation and allies we should carve out an exception to our/their policies and treaty obligations (NPT) and allow for a small scale development and deployment of a limited, regionally aligned and declared tactical nuclear military deterrent. This would be for SK and Japan to organically deter NK.
- Delivery systems only built to limited range, in this case about 225 NM to not threaten China. SK would be land based, Japan would build a sea based deterrence system.
- Limited deployment, at most, 30 missiles per SK and Japan.
- Very limited warhead yield, 5 kiloton maximum yield. Target intention is for deployed formations of conventional forces or static military / industrial installations.
- Develop and share Robust Nuclear Earth Penetrator technology for deeply bunkered targets.
- Targeting policy of no civilian population centers, only military / political installations. Reduces deterrence capability and could be stymied by human shielding but philosophically it is to be considered a necessary evil with every intention of only holding military targets at risk.
- No first strike policy. Reduces deterrence again but a philosophical statement of defensive and deterrent capability only.
The Army is already developing Long Range Precision Fires (LRPF) to replace the MGM-140 ATACMS which SK already has, develop a nuclear capable variant with a new small yield warhead and keep the DPRK at bay. If nothing, this will light a fire under China to change the behavior of NK as this would take sometime to develop, train and deploy and the only way for them to stop SK and Japan from attaining a nuclear deterrence capability is to eliminate the reason for their attaining it.