You would think this has to be a wake up call for the Russian military and their idea of conventional warfare. For their entire history since WW2 they have fought wars by throwing mass amounts of untrained soldiers and mass amounts of old, soviet era tanks at the target until they win by sheer volume. Tanks, especially the vast majority of old soviet models, are nothing now but big targets for cheap, mass produced anti tank weapons that can be carried by infantry. And without tanks, the untrained infantry are sitting ducks. Conventional warfare doesn't exist in the way that Russia has always operated when their enemy has even a modicum of modern technology.
Edit: Not to mention the Leopards Ukraine is getting **** all over every single Russian tank, except for the Armata which is unproven in battle and they probably have produced less than 100 total, and that's a generous figure.