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Because the real world is not a Civ game.

Because first of all they would then have to care for all of Russia's very nationalistic citizens. Second, why would they do anything while they can just sit and watch Russia piss away their entire economy and military?

Russia is an important geopolitical ally for China. Tension between them is not advantageous at this time.

Also, Americans love dunking on the Russian army, and while it maybe wasn’t as formidable as we thought, it’s still significant. It’s not as if it would be totally free.

what’s preventing China from just taking ALL of Russia

What for? Russia is already drifting into becoming a China's satellite state. Besides, there's another resource-rich, sparsely populated, 99.9% Asian country right by their border, with barely any security and which would've been part of China already if not for some weeb. If they are going for conquest, Mongolia would be the second target right after Taiwan, but attacking it would tip off Russia to go all in on defense.

Russia would never threaten China with nukes, because 1) China ALSO has nukes, and 2) China has been the only thing keeping Russia afloat recently.

The problem here is the amount of them and population density. Just one bomb dropped randomly somewhere in China would probably cause more casualties than the entire Chinese nuclear arsenal targeting the most populous Russian cities. And Russia has an order of magnitude more...

Russia would never threaten China with nukes, because 1) China ALSO has nukes, and 2) China has been the only thing keeping Russia afloat recently.

But it would have to be a scorched earth kind of invasion. The kind that pisses off basically everyone, because it leaves every single Russian, military, or citizen, dead. They'd have to come in, take everything, and kill everything. Take the land.

First of all, if you're being invaded by an army planning to genocide your entire population, then you have no reason not to use every weapon in your arsenal. If the options are A: China kills 100% of your populace or B: Launch nukes and even 1% of your populace survives whatever follows, then B is the most rational choice.

Secondly, there's no reason to assume that states will make rational decisions to begin with. I'd say the current state of affairs in Ukraine is a very good example of that in action. So even if China wasn't planning to genocide all of Russia, even if it was some kind of "benevolent" invasion where they were going to tiptoe around the flower beds, gently pry Putin out of the Kremlin, and basically leave everything the same except that now Russians pay for groceries with renminbi instead of rubles... there's still every reason to imagine that Putin and his top brass would still launch nukes on the mere principle of the thing.

So no, let's not glibly plan for a fast forward on nuclear Armageddon, thank you very much.

But it seems China is very VERY averse to war right now. Which tells me, they aren’t ready for a war.

Most american shit I've ever heard.

You're right, nobody wants to defend it. There's nothing there worth defending. I mean, there's Vladivostok, but it's not really worth going to war over. They could take a sliver of land at the Russia/NK border so that they could build a port, but I'm sure they have no issue with river traffic as it is, or just trucking into North Korea to use one of their ports. I'm sure China funded their construction anyway.