It's international politics. The rules are optional, and written on the back of whoever agrees to enforce them.
If you're going to run around declaring AI is a strategic advantage vital to national security, then guess what? Stealing it is a great idea. That you stole it is only a problem if it means you're not developing the ability to support that work locally as well, and China seems to be doing very well at building it's local talent and support network.
If you ever listen to Russian propaganda, there's a similar theme: every big idea, everything good, all of it was definitely first developed in Russia - only Russians could ever have thought of it. Of course, Russia isn't actually a world leader in any of those things, or able to execute on them.
Which is what America is sounding like more and more these days.