Hm. Interesting analysis there, JD. I like it. I had always understood that the Russians had had a hand in keeping some of the fleet going, but that's not to say the Chinese have too.
The stuff that's coming out now does seem to contradict the assements some years ago that led me to believe that very few were left. That may add weight to the theory that someone has been re-engineering them - possibly even re-engined them.
Let's invade them, nick their jets and find out. We have to or we may never know!