Yes, Russia has 200-250K dedicated in Ukrainian war? Isn't that like 20-25% of the entire active personnel (1 million total)? What I don't understand is, why doesn't Russia throw more warm bodies from the professional active personnel (1 million total)? Mass mobilization of low-quality conscripts is not desirable, but Russia has plenty of active servicemen to draw from?
(BTW, if you say "to keep 80% in reserve in preparation for NATO intervention", then all I have to say is.... that's what nukes are for)
If I was to ask you what the biggest failings of the early Russian campaign was besides poor use of air power, I would guess you will say logistics. If they were struggling and failing to keep 250k soldiers properly supplied in the field before, how do you think their logistics will handle a million soldiers at the front with all the losses they have suffered in logistics support vehicles and personnel already?
I dare say that if they did surge a million troops in as things stand, their logistics will kill more of those troops than the Ukrainians!
Also, just as you need 3 warships for every one you could operationally deploy in the long run, you can never field 100% of the troops you technically have available, even if you can support them all logistically. Because just as people cannot work 24/7 for long periods, they cannot fight wars 24/7. You need downtime to rest, catch your breath and refit before you can go back onto the front or your combat effectiveness is going to drop, drastically.
Which is another factor that seems to sail blissfully over the heads of the Zelensky regime in how they are running this war. The Ukrainians are fully committed for a short war, but increasingly, it looks like the Russians are gearing up for a long slog. This miss-match in combat posture and preparedness is going to become more and more relevant on the battlefield as time drags on; when the Russians can rotate in fresh troops while the Ukrainians are over-committed without reserves and their frontline troops become weary and exhausted from months of constantly being on the line eating crappy field rations and always being on edge all the time.