Russia is filled with revolutions and coups. From the Bolshevik revolution, all the way to the dissolution of the Soviet Union in the 90s. Sometimes it was just people, sometimes it was military elite. Again, Putin isn't Stalin nor Lenin. Bringing back kids in body bags, attacking what basically were Russian themselves and failing at it, implosion of the economy, etc have never been a recipe for success for any autocrat.
I do think this would need to come from the FSB or military (they're one and the same there), and stated as much.
The rest is not even comparable. North Korea is a laughable state. If Putin's aspirations is to be the next North Korea, it would be total failure. It would basically be complete regression.
China is on a different league altogether. They're the #2 economy in the world. They wield more power and also have much more to lose and much larger exposure to the world at large.
Russia's economy was already small. It's smaller than the economies of states like CA, NY or TX, and this is being an oil exporting country (50% of their exports right there). It's going to get a lot uglier economically for them the longer this goes on.