France had a mutual defense agreement with Poland in 1939 and it didn't help Poland much (or France). Moreover, nothing indicates that the American public would go to war with China over Taiwan. They would be far more concerned if football players went on strike, than if China recovered part of its territory (it is more like the Sudetenland than like Poland)
Taiwan cannot hope to defend itself from tens of thousands of Chinese long range missiles, the Chinese air force, paratroopers and ships equipped with radar guided, very rapid fire cannon that can shoot down SS missiles. The Taiwanese know it and will have to yield eventually.
The Monroe doctrine didn't prevent Russia from owning Alaska, France from invading Mexico or Spain from owning Cuba (until the beginning of the 20th century). It is just as easy to make agreements and policies as it is to ignore them when real danger threatens.
Last edited by samneanderthal; January 6th, 2012 at 17:24..