Putin to stop poisoning people.
Actually I see no rapprochement between Russia and the West until Putin is gone, even then Russian paranoia and suspicion may stop it happening. They seem to really believe the West intends to invade, which to me is nonsense. They have much, much more to fear from the PRC, yet they are appear besties now. Perhaps this parallels with the Ribbentrop pact last century.
For there to be a rapprochement with the West, either 1) Russia comes to see the PRC as a greater threat to their interests than the West or 2) the West changes tack towards Russia.
I've listed some of the reasons why Russia has such a dim view of the US, but another one is that the US effectively fixed an election in 1996 to keep a compliant President in power (Yeltsin), even though he was decimating the economy and sending Russia into military debacles (Chechnya).
When you consider the PRC's own grievances with the US (the whole 'pivot to Asia' thing marked the US as a belligerent rather than a partner), it's not surprising that China and Russia have teamed up for now. China and Russia are far from natural allies (Sino-Soviet split) so I don't think that was inevitable.