Russia had 20% of Ukraine
now they have lost 5% so now 15%
today also Ukraine pushed into Russian "claimed" territory
so question is what will Russia do ?
For Ukraine, gaining territory was relatively easy after they exhausted RUAF offensive potential.
I would argue, their overall strategic priority after March until Kharkiv offensive was to deny RU easy attack, and manoeuvre opportunities, rather than counterattack above all.
Now russians have spread themselves wide, because they themselves wanted to go on the defensive.... and here UA turned the table by throwing 10 brigades at a time enfilading thin defensive lines.
Answering your question now, the battle now will go for the next 10% of the territory, and after that, I bet, Kremlin will lose interest fighting for puny 5%, since Kremlin can't brag with a square face about wasting the entirety of world's №2 military for puny 30000 square kilometres of land.
The entirety of Khesanh province will almost certainly be going back to UA until the end of this month. AFU will also almost certainly be able to push past Krasna river, and reach Bila before the winter. That will be around another ~5%.
If UA will be able to herd RUAF into around 12% of remaining occupied territory, their advantage in long range fires will start to snowball.
Just 100-200 thousand untrained troops without tanks, and artillery would have zero chances to change the situation. It will be a slaughterhouse, especially if they will try to push conscripts into open fields in the south.
The best Russia can do is to stuff urban parts of Donetsk, and Luhansk with those new conscripts, and bid for time. Any other attempt at "Zerg Rush" is already doomed since AFU have already cleared the only remaining major area in the country where vehicles are at disadvantage. After UA will retake Starobilsk, RU will have close to none opportunities to employ infantry in the field.
If russian conscripts were ready just 2 months earlier, they could've bid for holding the Severo — Luhansk line, but now UA will have easy times cutting their supply lines in towns long the Siverskyi Donets river.