No. They can have 25m drunken vagrants wandering haplessly in foreign land and dying of frostbite. But combatants? They would have to know how to train a combatant, how to equip a combatant, how to motivate a combatant, and how to support a combatant. They do not have the ability to do any of those things. Russia is too poor, too corrupt, too mismanaged for that. Putin was self-intoxicated about numbers on paper and thought he could seize Ukraine easily. He was wrong about Ukraine but also he was wrong about his own country.
You can keep masturbating about your dreams of Armageddon, but it's not gonna happen. If Russia is foolish enough to bring out the nukes, Russia gets vaporized next. You think Russia is too big? In truth, it's too small. Destroy Moscow and you destroy Russia. The rest is not Russia, it's an empire that is only held by the iron grip of violent autocracy. If you think Kereks, Nenets, Kalmyks, Yakuts, Ulchs, or Buryats give a shit about the legacy of Peter the Great and Stalin, you're really, really, really mistaken (as always). All the Russian East has already started to fall into China's pocket, and mark my words, Siberia will be Chinese soon.