ps It doesn't matter how many Russians he throws into Ukraine if he doesn't have weapons with which to arm them.
Send 50m without guns and they will surrender.
At some point, the Russian people will turn on him and treat him and his supporters with as much humanity as he has treated them.
Like when Italy and Germany were rid of their fascists, it will feel like a spring clean for the whole world once the dust of the idea of Great Russia is swept away.