Read the policy.
"The US rejects any claims of sovereignty by any nation over outser space... and rejects any limitations on the fundamnetal right of the US to operate and acquire data from outer space".
The UN might not agree with this, but in my opinion, this space policy covers the China situation, as far as we are concerned, we don't tolerate interference and will take actions to stop it. (see my earlier excerpt from the Space Policy).
That is covered by the 1967 Treaty as it pertains to celestial bodies.
I read it. I don't think anti-espionage activities are implied. They will always exist. We will find (or have already found) a way to counter them.