It is very unlikely, if not impossible: China has repeatedly stated Taiwan is in China, Taiwan has repeatedly stated they, in fact, are the legitimate China, both prepare day and night for an invasion they never dismiss, and both are a direct threat to each other politically, geographically and culturally.

Japan ? They're as threatened by China as India, and nobody in China is planning for administrative take over of 130 millions Japanese anytime soon. And Japan has so many problems to solve already, they're not looking at bothering China enough to risk missiles.