I agree with 2-5. But we are not going to invade NK. We don’t have the capacity to do that and it would be a stupid move, anyway.
Right now China is on the verge of war with India.
My take is our problem is China. My vote call it what it is and do what we have to for an acceptable outcome. This time nuke the commies coming over the mountains. Best to settle these accounts, all of them, sooner rather than later.