alt Hacker NewsChina kind of says a lot of things Russia was saying for the past 20 years. A lot of the wester world (not all) said, yeah yeah, it's all just talk. Then it wasn't.
I sincerely hope China doesn't go that was as it is to me, despite all its flaws, a super impressive country, but I think it careless to ignore warmongering talk.
A LOT of countries on the planet talk about annexing their former territories, like Orbans Hungary. Others have actually done it (Armenia- Azerbaijan).
What do you want to do about it? Start a world war with them just in case to provent them from doing it (further)? Bombing them in the name of peace?