It seems to me that eventually Japan will become involved. Japan right now is the sleeping warrior. It has much history to make up. Hopefully Hiroshima and Nagasaki memories are not a discord with us today. Very strange how time changes as to friends and enemies.
I guarantee that the commies in China and N.Korea crap their drawers at the thought of a revived, crack Japanese army (with a modern navy and air force as well) just a few hundred miles away.