You're doing a poor job at pushing western talking points.China can buy Russian resources for now yes. But what about in 10 years time? In 100 years? In 1000 years? Don't forget Russia wanted to nuke China 60 years ago but was stopped by the US.
Also, are you seriously suggesting that Australia would be an easier military target than Outer Manchuria if Russia collapses? This is where the conversation started, go read back.
- I don't know if Russia will still be an ally in 10, 100 or 1000 years, but America isn't an ally today and will never be, not in 10, 100 or 1000 years
- Russia does not want to nuke China today, America both wants to nuke China today and 70 years ago during Korea
- Russia won't collapse if China backs them, while Australia will be a much easier target if America collapses, and America will collapse without Chinese backing.
Both side are kept from collapse by Chinese backing, ergo, if China has to cease backing one side and cause them to collapse, collapsing America means taking Australia and eliminate a current threat without increasing Russian threat, while collapsing Russia means gaining no additional resources, eliminate no nuclear threat and increasing conventional threat from a current enemy.