Dealing with North Korea
by force is not a sure thing, even for China.
The geography is daunting; Korea is a peninsula.
The only 'land' border is, in fact, a large river. The
Yalu is a formidable obstacle and the Chinese road/rail network in Heilongjiang, Jilin and Liaoning provinces, while much improved, is not as extensive and well developed as in other, more populated regions. A good logistical
tail would be essential because the DPRK military is large and
might not collapse at the first sign of Chinese regulars.
Xi Jinping is,
I think, a
traditionalist; if I'm correct he will eschew conventional war, considering it only as a last resort, and will try to
defeat North Korea by any other means. For the moment, the DPRK is as much a useful tool as it is a problem. The
"trick" for Kim Jung Un's government is to maintain that balance.
Edited to add:
Further to the above,
Ray Kwong, a well connected journalist/teacher/entrepreneur suggests that Korea
may have a good stock of nuclear weapons ...
... even the low end estimate (
guesstimate?) is enough to make even the Chinese think twice.
There has to be a better way ...