Going by China is not a good option and I Know Putin himself is quite aware of that, the truth is that Russia cannot be subjected to any country and cant stand to begin to develop a problem with china at long run, and creating a CBDC is the worse option here as well except they go for bitcoin, why is because launching a CBDC is just a showcase to advance the already delapitated Rubble into display in another form (digital), there economy will still be tie to the same condition on Rubble if they launch CBDC, therefore i see it as not a game changer in this regard for now.
But it is largely possible for the whole world not to give in on Russia economy, an economy is said to be stable if the world recognizes it, value it and patronize it, if Russia built it own system on blockchain and run CBDC who will patronize them? can Russia survived all by itself? No, there must be concession with other economies and nations to in other to build an outstanding result, a market that lacks patronage is a void as air in a vacuum.
It is simple, Putin should realize what he did as a global genocide which is unacceptable by any chance nor tolerated and make through his way to amend his actions to gain back the world's interested, secondly Russia should have a change in power. and lastly launch CBDC isn't the solution but rather compound to it, what about the international ties Russia has lost with many countries, who want to be identified with Russia as for now? none, the only solution is bitcoin and not Russia's Digital Rubble.