Oh yeah slavs women gonna have kids with minimum wage chinese workers
Russia has nukes
Russia can also switch sides to USA and leave Ukraine
Russia isn't gonna sacrafice Siberia for Ukraine
Russia would cut off oil and food which chinese needs
Russia who allied with USA would checkmate China not because they can beat china but rather china would be surrounded
It would mean china can't ever expand
Declare independence like taiwan? whats stopping russia giving Taiwan nukes?
The problem here is that Russia has a short vision of geopolitics, while China has a long-term vision.
If Syberia declares independence, Russians will not be able to nuke their own territory.
China takes all its time to annex Syberia little by little. Even if it takes decades. Their communist party will not change soon, contrary to Western politics who alternate and need the population support.
As a matter of fact, it's true that Russia will never accept to lose Syberia (or any other Russian region). But it would be a civil war, and the distance between Moscow and Syberia is gigantic. It would take too much time to deploy troops there. Plus be sure Chinese will sent a lot of military equipment to the Syberians.
China is actually preparing such a conflict for a long time. For example, China stocks huge quantities of food on their whole territory, food they massively buy from other countries (leading to food cost skyrocketing everywhere in the world), and food China produce itself and never sell to anyone.
About oil, it can be purchased from others countries like Venezuela, Arab countries, Africa.
However, the US don't want such a Syberian claim to happen and will do anything to avoid it. And one of the first thing is to surround China miliary, isolate the country, shorten its resources, damage its diplomatic relationships. China considers Taiwan as their territory and anyone giving them nukes will be seen as a pure declaration of war. Which is why the US haven't done that yet. But Taiwan is nowadays threatened by a massive military invasion from China, and the US clearly support Taiwan. The US don't care at all about the taiwanese people, they just want to surround China with ennemies, NATO members, allies, or neutral countries.
The real danger is not Russia pathetically trying to invade Ukraine ; the real danger would be China invading Taiwan, because the US would definitely not accept such a move. It could directly lead to a new Cold War or maybe even a WW3 (we're technically almost on a WW3).