Sure. Troop losses. Economic collapse. Forced regime change, although sadly I think that's wishful thinking. Nobody can get close enough.
Eventually they'll run out of rockets/shells/ammunition. Russian arms factories are already shutting down for lack of subcomponents and raw materials, and they rely on global supply chains to bring in much of that, they don't manufacture all of the subcomponents in-country. China could fill some of that gap but not all of it. And as you see from the global microchip shortages causing massive shortfalls in the production of computers, telephones, and automobiles, missing just one small $3 microcontroller from Taiwan or the Philippines can halt an entire production line of $100,000 vehicles. Russia is using up munitions at a rapid rate, and it'll take them years to replenish their stocks, if ever.