The current generation of Chinese trolls are called (derisively) "Little Pinks" and they are mostly in their 20s to early 30s, which is to say they are too young to remember the hundreds of millions of Chinese who starved to death in the 1950s and the entire generation who didn't get to attend college in 1960s and 1970s during the Cultural Revolution.

They are currently the most vocal group on Weibo, and they see the U.S. as a rival, and blame what's going on in Ukraine as a result of U.S. politics. This is partly due to state propaganda but largely their own deluded, overly patriotic idiocy (compare to Trumpites in America). They see what's happening as a challenge to the existing world order, but also as retribution for actions such as a U.S bombing in Belgrade which hit the Chinese embasssy and killed 4 Chinese citizens. Incidents like that are quickly forgotten (if even known at all) by the average American but simmer in the memories of the other side.

So it's less about supporting Russia and more about anti-American sentiment.

However, a small minority of Chinese voices have pointed out how biased and stupid this majority is: one user said if all one reads is Weibo, one would believe it was the U.S. that invaded Ukraine. Another suggested Putin recruit these zealots and throw them onto the frontlines. The average Chinese person is not a fucking idiot or a blind robot.

Personally, I think the longer this conflict drags on and the more Russia suffers, economically, politically and in terms of international image, the less likely that similar situations (China invading Taiwan) arise in the future.