Still not what I understand, dianavan.

The US is removing part of it's troops, but they don't belong in South Korea in the post Cold War world anyway. US troops will remain. No one expects Japan to support South Korea directly, only not to oppose US military action from Japanese bases. Russian is a long way on the other side of a hostile-to-them-China in this and probably won't have much say unless something goes to the UN Security Counsel. Russian didn't support North Korea in the Korean War, China did because China shares a border with them.

Does someone have a different picture of this?