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Zero plausibility checks. Only pure military strength comparison for both South Korea and Japan in 2004. Scenario: Clashes around the Liancourt Rocks lead to fully escalated war. Note: South Korea has ridded itself from the law that requires the president to request authorisation from a US general. ROK is still under the American defence system, however, and has US troops on the ground. North Korean response is out of the question. Sources: http://www.globalsecurity.org/military/world/rok/ http://www.globalsecurity.org/military/world/japan/ https://en.wikipedia.org/wiki/Republic_of_Korea_Armed_Forces https://en.wikipedia.org/wiki/Japanese_self-defense_forces Questions to be asked: How long will the war last?
Who will win the war?
How will they win the war?
Where will they win it?
Again, this is not about the politics that lead to it - this is about the military strategies and tactics that will be used, etc.
Go nuts. Go wild. Not so much that nuclear aggression is threatened, though. (Both have nuclear latency and the US would be strictly enforcing a no-no.)