Since neither country trusts the other even a little it should prove interesting. Remember Hitler and Stalin in WWII
That was my first thought, though I believe Putin is smarter than stalin. Xi is no dummy, either.
Actually they both get ready to fend off “American/NATO aggression”. But they indeed consider Taiwan and Ukraine as their lost territories. So I may conclude that West kinda cements their alliance.
If not West they would not ally at all. And the fact that China is a number 1 world economy motivates Russia. It is just interests here and no more.
If Russia may see that her interests are more satisficed with West then she will ally with West which she proposed many time. West was deaf.
So again it is all acts of West created this situation. Russia told West many time that she won’t agree to the role of a colony of West but West offered her exactly that.