"But the real basis of the Soviet school was its colossal infrastructure, creating a pool of millions. As the huge Soviet training campaign bore fruit, and literally hundreds of players achieved master or grandmaster strength between the 1940s and 1960s, a vast system of rewards and punishments was built up, with endless in-fighting and denunciations. The life of a chess professional was a privileged one: stipends were much higher than average wages, and foreign travel allowed. Botvinnik and his successor Vassily Smyslov were awarded the Order of Lenin, the highest civilian Soviet honour—no British professional has received so much as a knighthood."
that's why they dominate chess forever. the talentpool is huge, and education is good. nobody else comes close, in infrastructure and level.
Also Russia isn't dominting chess anymore. They have a single player in the world top10 and 3 in the top20. [1]
Except Magnus, the top 100 are 150pts apart, which is extremely close in ability. #100 could expect to beat #2 in 1 out of 3 games.