It seems like you will be able to hold cryptocurrencies and mine them. You are just not allowed to exchange it to Ruble...
Moiseev went on to say that, under the proposed law, people would not be penalised for mining cryptocurrencies or converting one cryptocurrency to another.
So its not an outright ban of all cryptocurrencies which might be a good thing, under circumstances. With an outright ban bitcoin would have been pushed to the 'backstreets' so to speak. With it being legal to own it will allow for the word to spread and this might just lead to it eventually being allowed if there is enough pressure from the public.
The way I read his statement was that they want to criminalize the conversion between bitcoin and ruble (specifically).
That sounds absurd to me. People would run exchanges doing conversions to euros then to rubles separately.
Assuming he meant bitcoin to all fiat makes more sense, but it looked like he specifically ruled that oit.