The BBC runs a project researching the Russian losses through open sources. Their numbers are under 10k. Why do you think the Russian losses have to be higher than of the other side?
"They did not set out to document every death, and estimated that their Russian count was about one-third to half the true total. But by harvesting as much information as was available from social media posts and putting a name to every death listed, they figured their number was better than an estimate."
Your own source says 20,000 to 30,000 killed in action.
Why do you post false and misleading statements?