This is more of Western wishful thinking then reality . As long as both Russia and China have means to deter each other (i.e. nuclear weapons) , large scale conflicts are excluded . Both sides would have far more to lose then to gain from this .
On the other side , given Chinese territorial disputes with Japan , Philippines and Vietnam , not to mention US interference with Taiwanese business , partnership with Russia is logical and beneficial for China in next 10-20 years .
I think conflict between a densely populated, economically powerful but resource deprived china and a thinly populated, economically weak but resource rich russia would become a more steady, potent, long lasting, and influential reality than you realize.
Even if it is beneficial to China to keep smiling at Russia for the next 20 years, Russia would have to concern itself with the fact that the unerlaying causes of conflict with China would be vastly more long lasting than a mere 20 years, and Russia's fundamental situation would only have become worse in 20 years regardless of how much the Chinese may smile during this 20 years. Unless Russia seek some sort of external aid, sooner or later the disparity between Russia and China would become so great the Chinese wouldn't bother to smile anymore.
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