There seems to be trouble with some of the AI's not being nearly aggressive enough. China's been at war with Tibet for almost a year now and it hasn't even attacked yet. Similarly with North Korea, even though it has local superiority in terms of divisions, it never attacks South Korea.
Maybe this will help re AI - from THIRD REICH AoD MOD
USA AI is far more aggressive (accomplished by lowering its min_attack_odds below 1.0)