Anti-missile tech really doesn't work.
50% success rate at best.
I don't believe any of our latest has been live tested.
It's also not in South Korea.
North Korea could get in a few rounds before cruise missiles decimated their border defenses. I don't believe they could "flatten" soel in an initial volley... but then again we cannot flatten n Korea in a single volley unless we used nukes and all thier stuff being amassed at the border makes that a no go (besides the whole nuke thing)
I am not a general though.
I do believe the current "crisis" if you want to call it that is this test nuke would be able to be mounted to a missle and strike Japan. I don't think thier current nukes can be launched, they would have to deliver it by train to s korea.
Again... not a general and I have no security clearance. Hopefully the test fails.