This is just confirmation bias. You're looking for patterns so you're finding them. If you look for the opposite patterns you'll find them too.
Russia besides the mandatory invasion every decade has been infiltrating the west and avoiding the direct confrontation for decades, they spent a lot of money on encouraging brexit, trump and financing a lot of far-right and far-left parties in EU in hope of breaking it.
Russia also invested heavily into gas infrastructure hooking up Germany to have direct influence on its politics.
China isn't above invading some countries either when it thinks it can get away with it
https://en.wikipedia.org/wiki/List_of_wars_involving_the_Peo...
China is also currently running concentration camps for hundreds of thousands of people. Somehow we don't talk about that.
Both countries are agressive militaristic dictatorships using whatever tools they think will serve them best at the moment. China is simply more patient because it isn't in obvious decline (yet).
Another contrast is that China is importer of basic resources and exporter of goods - so it needs international peace to profit. Russia is exporter of basic resources - so it needs international chaos for best prices. When you listen to Russian economists they often talk about international "pressures" that are beneficial to their economy because oil prices go up.