Well, the countries its about first of all, China, Cuba and Russia I suppose u mean, have all great traditions in sport overall not only volleyball, the countries is intrested in too build strong NT´s in all sports. Also two of them very big population. Russia also has very tall population to most other countries, while Cuba is superior to almost all other in terms of athletism. Factors that make their oppurtunities for volleyball very good. China has so much population that they pretty much will be a force in whatever they are intrested in. So, in my opinion the reasons is other than politicial. But one big advantage is that in these countries, pretty much ALL players that plays for NT, plays in the domestic league, and many of them the same team, it makes them very well together which is a great advantage.
Mmmmmm...It makes sense. Thank you very much