They will be chewed up. Russia was considered to be number 3 in the world and have been decimated with over 500k dead and all their top armor gone. Don’t believe me? Take a look at the May Day parade where only 1 WWII T-34 was present.
Paper tiger. They did have some quality units with their Spetsnaz and VDV paratroopers but they were all chewed up in the opening days of the invasion.