I just don't want to bullsh1t, let go straight to the fact, Who is the one causing Soviet to collapse, Western nations or China, yes in the pass Russians used to paint Chinas yellow perils but who has put Soviet in peril, ironic isn't it.
I think Russia has realized who is the real threat to them after all these 1990s suffering that Russia people had to endure, Gorbatchev was so naïve to believe that the West and US will be friend with his perestroika and offer Russia economy assistance but end up to be got screwed big time, all their eastern tradition ally had fallen apart, one by one tilt toward the west, Russia become so isolated.
Only Sino-Russia cooperation will deter Western from doing greater harm on both nations, this relation shall last as long as US is still a threat, no need PhD to understand that. We Chinese don't need to sell anything to convince Russians who is great threat to them, the more we bullsh1t more they will take that as lie so we will let them to decide who is their enemy...pure and simple.