No ture --

1) I don't think that Japan invaded China was affected by western opinion.
Americans did help us fighting Japanese. (From volunteer flying tiger, http://en.wikipedia.org/wiki/Flying_Tigers; to throw nuke in Japan.)
2) If not for north Korean leader cross the line 58 years ago, Taiwan was united to China already. (American decided to give up Taiwan. Korean war changed its mind.)
3) Remember what our smart ancestor said: 远交近攻。