I suspect they'll have a lot of problems bringing along all the NATO countries in any action against China.
I don't think we should be to worried about Chinese sea ports in various places - like the German overseas bases at the start of WW1 and WW2 remote naval bases are easily mopped up.
I'm rather intrigued by the actions on the Indo-Chinese border - it's a classic area that , in a perfect world, they'd sit down quietly and sort it all out - there is nothing of value there - but they continue to argue over claims going back to the Raj years before either of the current parties were anywhere near power- crazy!