CBDC is a close possibility, but the reason I don't think is sanctions. I don't know if the two countries will reconcile someday, but if the policy of using the ruble to import gas from Russia is profitable, then the policy could last longer (or forever) and expand to other trades as well.
They might consider it but not that necessary, at least for now. Russian ruble actually recovered well since it dropped heavily after starting to invade the whole of Ukraine. Thanks to Russian gas and oil which Putin took advantage by demanding transactions to be paid with ruble.
Currently the Ruble is pegged to gold to maintain its value stability, with a value of 5000 rub = 1 gram of gold
With Russian gold coming under sanctions, the country's gold stocks -- from banks as well as individuals could be sold to the central bank. The value of the ruble will further increase once the central bank's gold stocks from domestic sources increase, which is expected to happen in the next few months.