Unlike the Russians, the Wehrmacht was a formidible, experienced and well equipped force - *had* their Imperious Leader allowed his Generals to formulate and execute the necessary battle plans, instead of micro-managing as well as fixating on Stalin's name-sake, the Soviets would have been in serious trouble.
With Russia, there is just too much to list, as to why Ukraine is wiping the floor with their ass, but it harkens back to the Winter War and little Finland shredding the Soviets in a similar fashion: poor leadership, poorly trained troops, poor morale, poor logistics, poorly equipped, unreasonable/unrealistic goals and so on.