Konstantin Rokossovsky [1] was a Polish-born cavalry officer who was imprisoned and tortured during Stalin's pre-war purges - he later replaced the teeth that his interrogators pulled out with metal ones. He was eventually released and returned to military service, fighting loyally in multiple theaters of the Eastern front. By the end of the war, he was a top general and a loyal Soviet for the subsequent two decades.
A combination of fear, rabid ideologues, and lack of alternate economic opportunity, creates a breed of soldier that we would be wholly unfamiliar with. The Guardian is projecting the war's outcome from a younger generation of Russians serving on the ground or posting on Facebook, but the only way to understand the leaders is to reach back in history.
[1] https://www.beachesofnormandy.com/articles/The_man_with_iron...