And my point is your assertion that the Russians are only...

And my point is your assertion that the Russians are only replacing losses is misguided.
If the Russian army was in such dire need of people they would be engaging in conscription.
It is also well aknowledged the Russians have over 300k reserves sitting in reserve in the rear both north and east of the lines of contact!
Also the Russians have just opened another axis in Sumy region, yet again forcing the Ukrainians to redeploy forces, again robbing Peter to pay Paul, this is why the Russians are now making steady gains across the eastern line of contact in the donbass area of the front.
Actions not exactly indicative of an army struggling with numbers!