The budget revenue deficit for just the January of this year exceeds the deficit for the entirety of 2022. Russia has reserves that it can employ for the time being to mitigate some of the damage, but they are not bottomless. If the pace of losses continues in a similar manner - most of the reserves will be exhausted by years end.
After that - one might expect the usual tools to be employed - cutting budgets to pay for civil workers (everyone other than security), pensions etc, attempts to raise money from already struggling businesses via wartime taxes, issuance of wartime bonds to population to borrow cash, and if all fails - start printing money to plug the budgetary shortfalls, and the resulting inflation.
I dont think the kremlin cares for any of these, except may be with brain drain (which they can easily fix by preventing movement of people).
As long as russia produces enough food for the population, a subsistence living is "good enough" in the eyes of the kremlin, and thus these sanctions doesn't hurt as much as the west had hoped.