Russia doesn't have the men or equipment to send until they win. Doesn't matter if there's 500k men with rags and rusty 1 rifle per 10 men. It's gonna be like those Civilization games where you send 1 ancient era warrior unit against a Giant Death Robot.
Russia having a large population doesn't help when their demographics are fucked beyond belief. The more they try to force unwilling mobiks, old people and other not-suited people to a war for just Putin, the more likely is that Russia actually falls apart in the long run. And no one will be there to help them this time.
I have to ask, why is there such a hopeless lament about all this? You have seen how the mighty empire has already failed so goddamn hard, but you (plural) expect Russia to somehow just simply stop dying as they already have and become some sort of miracle weapon?