China for sure. Taiwan only on paper, in practice it's fine with the territory it has and has no ambitions of ousting the CPP and regaining it's former territories. But if Taiwan breaks this "stalemate" than China will consider it a declaration of independence. Which is also weird, since Taiwan (formally the Republic of China) has been an independent nation since 1912 and is a direct continuation of 250 years of Qing Dynasty rule. Whilst China (formally the People's Republic of China) was split of from the ROC in 1949.

Which even weirder is that the British obtained Hong Kong from the Qing Dynasty. And since the ROC is the continuation of the Qing Dynasty, Hong Kong should be returned to Taiwan. But for obvious practical reasons that was not what happened.