"China tweak a bit of rules and Japan crash."  Given the hate-on you and your comrades have for Japan, you'd think that if they really could, they would have done so already.  Maybe bringing Japan down, if its as easily done as said, might reverberate back to the Politburo?  The proletariat, having sweated it out in the sweatshops wouldn't be too happy if they lost their crumbs.