That's because just as in the Kamil thread you shared (I think), even if Russia made a peace treaty with Ukraine, Russia as a state is already fucked. Only the complete annihilation of Ukraine as a country can be considered as a "gain", even then it's already a small "gain" at this point
Even if the sanctions are revoked, no one in the west is going to buy their resources and commodities anymore, especially the west. Where else are they going to sell it to? Asia and Africa's trade ability pales in comparison to US and Europe combined, and Asian and African countries would chose instead to buy things from countries closer to them than Russia, especially resources. And no one would export their stuffs to Russia because their economy and currency are fucked. They can't buy, they can't sell
Their military that have been mythicised for decades have been ridiculed in the global stage, no one will fear them militarily anymore. The only thing they have left are nukes, but everyone knew you can't use it unless you want to paint a massive target on your back, so one would actually entertain their threat. Even China is most likey going to surpass them as the PLA reform themselves
So instead of stopping the slow decline of Russia, Putin have instead accelerated it by a massive degree. Russia is finished, and only the complete destruction of Ukraine in this war can soften their demise