So they are ramping up to justify restarting the Korean war then? Didn’t I hear the DPRK was preparing to repel an attack from the South recently? I would hypothesize that they want to make it look like NK started it by aiding Russia so when the west pushes SK to attack it doesn’t look like they are outright aggressors.
I feel like this is going to be for a very specific type of flight that will be in only the most necessary cases for ultra fast travel. Otherwise the vast majority of domestic travel will be by the high speed rails.