if you want facts go read the news, not history and economics textbooks (not that studying-up is bad), which by the sounds of things is all you do...
FACT: china made a bill recently for the purpose of invading taiwan
FACT: the US placed stelth bombers in guam to play big brother over N. Korea
FACT: korea has the power and willingness to test nukes
FACT: what I said about Russia was to portray the idea of the choice they'd have to make in who to side with (but you make a good point, it would seem a more logical and economically safe decision to side with the US)