Did the former Soiviet Union create a race of super boxers?

In the movie Rocky 4 Ivan Drago was doing anabolic steroids and other enhanced training methods. This is actually based in fact. We have this big freak of nature Nikolai Sergeyevich Valuev and the klitscho brothers also Fedor Vladimirovich Emelianenko the Russian mma guy. There's also many champions from many sports in the former Soviet Union. What do you think?