Where did you get that idea? The Soviet Union didn’t even lose one dozen-million in all of WWII. Ya know, the war famously won with “British intelligence, American steel, and Russian blood.” The Ukraine war has been devastating, but it’s nowhere near the scope of the largest war of the twentieth century.
Edit: to be crystal clear because for some reason my fact-based post (see: Wikipedia’s WWII fatality records) is getting down voted, Russia bad, slava Ukraini.