That wasn't a super realistic consideration until a few weeks ago.
This hasn't stopped ROK from thinking the Biden Administration wouldn't come to its aid if push came to shove.
I see your point but the effect is going to be much, much less "discrete" and more "diffuse" if at all.
I'll buy you a beer if ROK or Japan have a nuke in 10 years.
That wasn't a super realistic consideration until a few weeks ago.