Does Russian currency devaluing actually mean much?
At a guess it'd probably make people want to spend less if those value reductions impact the cost of services there.
If Russian currency isn't being used much in the external market, maybe that's why. If yuan and rupees are the main currencies for buying oil, Russia could be holding those currencies instead or exchanging them for cash equivelants.
A lot of devaluations in war are a result of other things such as currency counterfeiting and talent fleeing abroad to a safer country.
I believe that fundamentals of Russian economy appear robust when we look at them in the context of its substantial oil and gas reserves. This positions Russia as one of the major exporters of energy to Europe and many Asian countries including China and India, and those are significant world economies. However, unlike US Dollar, the Russian currency Ruble is not much used as payment method for global trade. This limited global utilization of the Ruble could contribute to the lower exchange rate of on the global market.