They seem to manage very well as far as military infrastructure nukes, missiles..... There are few countries in the world that can match NK when it comes to adpating and over coming short falls in infrastructure.
Depends on how bad they want it. As far as SK spy network I trust it on NK far more than our own. I see no plus in SK bragging about NK have such technology.
I like your ‘probably’ part. Reminds me of this:
“There is no greater disaster than to underestimate danger. Underestimation can be fatal.”
I would say that the best way to handle it is to hope they don’t have the technology or the means to delvolope it and plan as if they do.
We know what emp devices are. The stuff that’s out there, and which was used by the US against Serbia more than 25 years ago, is not nuclear pumped. Not nuclear pumped has very limited use.
To get nuclear emps, you have to get a device small enough to get it in orbit. All NK seems to have been able to, so far, is gigantic fizzles - maybe not even true nuclear explosions.
And no, the emp device does not lend itself very well to improvisations in materials.