Can you explain what you are thinking? One implication is that China is supporting Russia because they are afraid of a Russian military actin, but is that what you mean?
To use a crude analogy - if you're in a apartment complex you would probably be nicer to your neighbor than if they lived in another building, and not literally next to you, right?
Russia, China and India are the three neighbors living in a triplex. Meanwhile the United States is in a mansion surrounded by a moat a mile away.
If one of your neighbors was beating up and stealing from another of your neighbors, are your really saying you’d cosy up to them? By this logic you’d expect Finland to be Russia’s best friend.
I am critical of the Chinese system of government, but I’d never think of them as cowards.
"Finlandization is the process by which one powerful country makes a smaller neighboring country refrain from opposing the former's foreign policy rules, while allowing it to keep its nominal independence and its own political system. [...] The Finnish political cartoonist Kari Suomalainen once explained Finlandization as "the art of bowing to the East without mooning the West"." [0]
The Soviet Union's collapse allowed Finland to spread its wings a bit more broadly, but it's worth pointing out that yes, Finland was cozying up to the Soviet Union like mad, in order to best survive their physical proximity. The logic does seem to check out, at least while the bogeyman of the USSR still shambled around.
Also, I guess you can’t explain why Finland isn’t Russia’s best friend despite bordering Russia.
If you can explain why your argument doesn’t apply to Finland, I’ll point you to a news report showing China’s support for Russia.