For some reason people here really want to believe that Russia is holding back significantly, while partly true because they haven't mobilized yet and aren't completely razing cities yet, they are sending many of their better units and equipment.
Many of the divisions and armies involved are on the prestigious end of things and consist of some of their better troops, such as 1st Guards Tank Army which has been involved around Kharkiv.
They are sending their best equipment that actually entered serial production, if you take the major modern equipment Russia has that people keep mentioning, like the SU-57, the T-14, and the T-90M, you won't even get 100 pieces of equipment if you send every single one of them to Ukraine. they suffer from the same issue a lot of late war German WW2 designs had, they are produced in so few numbers that their overall strategic value is very low. I don't think war is a numbers game where you can get by with making shit tons of T-34s anymore, but if you can only make a couple dozen of something they won't be worth much against a major army, because even if you only lose a single one per day you're going to run out of them fast.
People still believe that Russia is this gigantic military superpower still, pointing to their military spending, but that's only an on paper number. I'm willing to bet at least half of that budget winds up either A.) Basically evaporates because it ends up in some Quartermaster or Officer's pocket instead of being spent on keeping things maintained and up to date. B) Spent on stupid projects that never actually make it to serial production like a nuclear powered cruise missile. C.) Spent on keeping Russia stupidly large nuclear arsenal of 6,000 warheads maintained, which is extremely expensive when even 1,000 warheads will cut costs massively and still be a massive deterrent.
This whole thing really should show people that Russia is a paper tiger, the whole Russia being a military superpower is a figment of the USSR days where they actually had a good amount of that military power they boasted about and the West had every reason to hype them up, but a lot of that was due to their manpower and relative high tech military production equal to the US during a good part of the Cold War.
Now Russia struggles making high tech military equipment in actually strategic significant numbers, many of their modernized T-72s and T-80s still seemingly lack Hard Kill APS, and they completely lack blowout panels (which is why the Turret Throwing Competition has been such a fierce contest), they've been struggling to make rifle scopes standard issue (most engagements take place in the 100-300m range, which is why ACOGs are so popular, but even Red Dot Sights can help), their NCO corps are laughable and prevent opportunities from being enacted upon and force them to stick to a heavily detailed plan (this is also a major reason we've been seeing so many dead Russian junior and senior officers), and we've been seeing so many armored units getting ambushed and destroyed because they have either no infantry support or very little (Seriously what the fuck this shit was figured out in WW2 where armored doctrine was actually solidified, this isn't the interwar years where nobody knows what exactly we should do with this new 'Tank' thing).
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