Internal stability is indeed very likely the biggest concern for the guys at the top. This is strongly supported by the their monetary voting patters and family movements.
Recently the whole offshore wiki saga has once against shown just how much dubious money the wider communist leadership has transfered by dubious means away from home into the tax havens of the West. I hope that a least some of those NSA billions get spent to keep tabs on those movements because it might be one of the best ways to monitor short-term Chinese military policies.
Perhaps the only better indicator are the many Chinese students who enjoy the great American institutions of learning. It is an open secret that a high percentage of the key players is sending it's kids to study in the US. It does not take a genius to figure out some important implications.
Overall the key maritime trade flow is certainly not the only thing which can be rather easily cut. All in all the Chinese rise and integration is a great success story for it's citiziens and had and has big trade-offs for other countries. It would be foolish to disregard either.
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