Do we realize that most of the mass murderers of the previous century have been trained in Russia?

Mao Tse Tung – trained in Russia
Kim il Sung – trained in Russia
Fidel Castro – trained in Russia
The Khmer Rouge – trained in Russia
Stalin – trained in Russia (and still worshipped today)
Of all the great mass murderers of recent history, I think only Hitler was not trained in Russia, though the Nazis did have material help from the Soviets from 1939-1941, including training on how to build concentration camps. (Something the Russians had long-since perfected.)