No, China has no interest in this.

China has an interest in the normalization of reconquest and regional spheres of influence superceding other norms, and an interest in both Russia and the West being focussed on conflict in Europe.

Despite its totalitarianism, China isn't very expansionist or aggressive. Significantly less than Russia and the US. Wasn't their last war the annexation of Tibet in 1951? They do make it very clear that they consider some countries and territories an intrinsic part of China (Taiwan obviously, Hong Kong, and this was also the case with Tibet), but they're generally not very aggressive about taking them, and extremely patient about waiting for the right moment, and tend to do it with minimal bloodshed. So far at least. (And only in their expansion; they have far less scruples about domestic bloodshed.)

That said, I believe the Soviet Union has taken quite a bit of land from China a long time ago, and although they haven't made any claim on that land yet (unlike with Taiwan, Hong Kong, and the South China Sea), I can imagine China might want it back when the time is right for it. Like a serious collapse of Russia. But I don't think they'll go to war over it.

Also, apparently there exist some Finnish imperialists who'd like to annex Karelia, and possibly some other parts of North-West Russia.

> Despite its totalitarianism, China isn't very expansionist or aggressive

That's...debatable, but it has one particular clear, specific interest in normalizing reconquest of formerly-held territories, irrespective of whether it is “aggressive” or “expansionist“ in any general sense.

> Significantly less than Russia and the US.

While it has integrated as states some territories it already held in that time, the US has been anti-expansionist since 1947, voluntarily relinquishing formerly-held territories and seeking neither to acquire new ones nor to reassert sovereign control over former ones. (The US may exercise strong influence over foreign states, including many that it formerly administered as territories, and may entertain the idea of integrating existing territories as states, but territorial expansion hasn't been on the table for a while.) China, in the same time period, has launched several wars for territorial expansion.

> Wasn't their last war the annexation of Tibet in 1951?

No. Excluding internal (even arguable, like several with the ROC) wars, since 1951 they've fought in the Korean War, several wars with India, the Vietnam War, several wars against Vietnam after the Vietnam War, and some others. Against both India and Vietnam, particularly, their goals in involved territorial expansion.

I stand corrected. Maybe I notice it less because it's on the other side of the world, then. That's definitely a factor that skews our perception of such events.

Yes, because the next big attack of a major country invading a weaker democratic country will be China invading Taiwan. Unless Russia gives up on that meany Ukraine and attacks the belligerent Moldavia (expands the separatist region) because they want a victory.

The remaining Azov troops just surrender in Mariupol, they have been winning pretty hard lately.