Not sure how realistic this actually is.

NK prides itself on keeping its citizens as isolated as possible from the outside world.

If stationed in the Ukraine then they’re going to pick up an awful amount of information that will shake their worldview and I’d have thought making their reintegration back to the motherland exceptionally problematical at best.

Even the Russians will happily have fun with their NK “chums” shattering everything they’ve been taught - because, why not?