Russia, being cut of from the West, and being incapable of sustaining itself economically, has no choice but turn to China, increasingly on China's terms.
Here are some sources that address China's aspirations for taking advantage of the impending disintegration of Russia. It has been apparent for quite a while::
But now China’s presence in the Far East is being felt in an altogether different way. Beijing is behind billions of dollars of investment in the region, fueling both the stagnating economy but and tensions with the local population.
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While some in Russia’s Far East do occasionally speak of an independent “United States of Siberia,” the idea lacks prominent supporters or any realistic prospect of success. However, the tensions behind it and the growing resistance to being directly governed from another continent will continue to define relations between Russia’s center and its extremities. For those in Russia’s Far East, Moscow might seem like a world away – with eight time zones and a five-day train journey dividing them. Now though, the distance between the two looks to be growing.
https://thediplomat.com/2020/10/the-distance-between-moscow-and-russias-far-east-is-growing/
Even though [China's Communist] Party delegates baked new anti-Taiwanese language into the Communist Party’s constitution, the real territorial temptation for China might be to the North, in the Russian Far East, where hundreds of thousands of ethnically Chinese Russian citizens, trapped in a substantially weakened and hollow dictatorship, could potentially be enticed to reconsider their options.
While there’s no way to know what Xi is thinking, China’s long-established pattern of behavior suggests that, as Russia redirects border security units to a grinding conflict in Ukraine, it is worth considering if China might be mulling expansionist contingencies to the north, along the sprawling and sparsely held 2,615 mile Russian frontier.
https://www.forbes.com/sites/craighooper/2022/10/24/as-russia-gets-weaker-xi-jinping-may-forgo-taiwan-to-grab-eastern-russia/?sh=7216190b6ce4
Russian President Vladimir Putin has had enough of the nice talks and being large-hearted. Now Moscow is moving towards putting their interests at the centre stage and having the hard talks with the concerned parties which were delayed for a long time. For a while, Russia has been making nudges to remind the Chinese Communist Party to not attempt any adventure in the Far East, and now with the demand to 1 million illegal migrants to leave the country, the message is clearer than ever.
https://tfiglobalnews.com/2021/04/17/putin-warns-all-illegal-chinese-immigrants-living-in-its-far-east-to-leave-or-get-punished/
On edit: China also has historical claims to large parts of Siberia which are more legitimate than Russia's claims to Ukraine.
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