Hit Guam or any other US ally with a missile, and the world will witness the absolute power of an Ohio Class sub. 24 birds at 10 MIRVs each? Hard to fire artillery when you’ve been vaporized.
Seoul would not be pummeled with arty - it wouldn’t exist.
Uh... Seoul is the capital of South Korea.
Just irradiated into a ghost town in your scenario.
“Seoul would not be pummeled with arty - it wouldn’t exist.”
Just make sure it is done when the breeze is blowing north.