Unfortunately, all it will take is one of the Korean groups to be responsible for destroying another Korean group in Ukraine for any retaliation to make it’s way back to the homeland.
Hell, the story doesn’t even need to be real for one of the Korean governments to start lobbing shells over their border.
Honestly, I think this is the plan. It was super weird for NK to actually blow up roads on the border. With that, combined with the timing of them sending troops to Ukraine is even more sus. This probably has more to do with US elections, than anything else.
Oh, OP is already contributing, for sure.