It starts to put a clear price on unilateral action in the international arena.
It also challenges China's confrontation with Taiwan which is nonsense and would disappear the same day the communist party was disbanded. It is a diplomatic leftover.
Historically Taiwan was seized in the seventeenth century by a Chinese warlord from the Dutch who truly have the first rights for what those are worth after an indigenous population which then was scant. Thus an independent Taiwan is no far stretch and can be compared to England and France who have less legitimacy for separation.
China needs to learn that the more they push the more that the border states will act to strengthen ties with each other and the USA. There are smarter options.