How will they succeed in banning crypto completely from Russia even if they try to! Many countries has also try to ban but people always find another alternative to engage in crypto activities, there are many crypto enthusiasts from Russia, many project team from that country, so I don't think it will be easy for them to ban crypto.
If they prohibit doing crypto business or restrict individuals from using cryptocurrencies, it may cause technological degradation for the whole country and significant growth of black/grey markets. I am not sure that is what government really wants. Consequenses may be disasterous. Tax revenue is decreasing, the budget is suffering, and funds are flowing out of the country.