Actually there is more than enough sitting to their north, and they have been playing nice to Putin lately. I have a feeling that this will be the productive direction they take, a few new rail lines to the north and all that empty vast treasure trove of resources can be accessed for cold hard cash that the Russians need.
That may happen, but the Russians aren't exactly cozy with the Chinese. They tout their "alliance" with the Chinese whenever it helps them to use it to scare America, atleast in it's population's view. Otherwise, they know the Chinese danger lurking in their background.