The notion that China will invade North Korea is absurd so China has nothing to fear from North Korean nukes
China cannot invade because it fears NK has nukes.
The SLOC to South Korea cannot be protected
Why not? Is PLAN all powerful?
That’s probably easier to type than do. If war comes to North Korea both the Chinese and Russians can set up “security zones” in the north of the country, which would function like safe havens for the North Korean army and government, and then what South Korea has is an endless war. And that’s even assuming Kim doesn’t make South Korea glow or dunk them in VX.
The odds of NK invading SK are vanishingly small. The odds of SK invading NK are even lower. At this point both nations simply want to be left alone and talk about re-unification at some future date.