I agree with your post but just have to point out that Belarus is already under Russian control - I think Kazakhstan is also in Moscow's "sphere of influence". Latvia and Estonia are NATO members now so are immune (at least I bloody hope so!). The one you missed was Moldova, there's already a semi-autonomous region of ethnic Russians there, however as it doesn't border Russia (it borders Ukraine mostly) I'm not sure what Russia can realistically do there.
doesn't NATO only count in the event of a nuclear attack not a conventional one