Letting China start annexing nearby territory, especially of our allies, is probably the dumbest thing the US could do.
What allies do you have in mind? The Nato article 5 won't allow that and as far as I know it's never been up for question with China. You do understand that China has decided on a peaceful approach instead of a military response to US/Nato aggression and expansionism?
What would you do? Do you want to be Churchill or Chamberlain? I'm a Churchill guy myself.
I can answer your question if you can lay out the hypothetical you're imagining. As it stands right now, I see it being the US that has intentions of encroaching further on China's borders and so it's more a question of what should China do. I can answer that one too!
Currently China is in the process of forming a peaceful alliance with Vietnam. Any comments on what the US should do? The US has been cut out and has been displaying very large naval force in Thailand.
If China wants to please antiwar.com they should probably not annex other countries.
Did you allow one of your chiildren to write that last remark? Just let me know if you're not up to this Gorgeous.