There is reason for concern because this is the kind of situation where you could get a military confrontation, although both sides are cautious about it. The Chinese believe with some reason that if one renegade province can break away from China, many others can. I do not believe that either side right now really wants a hot war. Even if they want it, the long-term cost would be staggering. Their economy would go into freefall and that would not be good for the longevity of the Chinese Communist Party.