South Korea should think of expanding its army and navy. America will not be able to defend them if a general war hits. Japan may not want to risk nukes if there is a world war. She may stay neutral. Time to pick a side: The West, The Axis or stand down.
The ROK might want to consider sending some of its army planners to Ukraine, to experience an intense drone and artillery war upclose, and the true performance of western AD vs hypersonics