Probably because he doesn't know who is who, China doesn't know either, it is only through compromised communication that CIA assets are identified. Also, informants do not necessarily need to be high ranking, someone in the loop is enough, like a no name bureaucrat or aide, a country cannot be ran with top official alone, even if it is only in the discussion phase.Can someone explain to me why Putin doesn’t do a purge of CIA assets? Are you seriously telling me the descendants of the KGB that ran the CIA like a dog and pony show can’t at least purge the informants out of the higher ranking officials?
I believe CIA communication intel is shared with Russia in 2010, but I'm not sure if they've done much about it.