Russia and China have every interest in keeping the U.S. busy with an insoluble NK problem.
If we could simultaneously detonate 60 nukes along the 163 mile North/South border it would still not stop the North from sending devastating artillery and rockets into the South and killing hundreds of thousands.
Crypto-liberals...so unappreciative of what a hyper-power like the US could do to a nation whose denizens have to eat grass to subsist
Such a strike would take out 80-90% of the NORK hardware and kill or befuddle almost all of the troops manning it. The downsides- airbursts would not do the trick, so ground proximity or impact fusing would be required. It would result in massive amounts of fallout for somebody, depending upon wind direction and velocity. And such a strike would be very difficult to coordinate.
Not a good idea. Better to just kill Li'l Kim.
The NK is a perfect testing ground for Russian and Chinese weapons designs.