But mainly because they are so insecure about their own currency - Ruble
Obviously, you don't understand how things work, especially in Russia. If the government decides to outright ban Bitcoin (which they still refrain from doing after so many talks and speculations, mind you), people will get seriously interested and may actually start buying into this thing called Bitcoin. Since it is considered as a given that if government decides to ban something like the US dollar (there were precedents), peeps get agitated, rumors start circulating - the conclusion inexorably being that the authorities wouldn't ban something which they weren't afraid of...
This is surely not what the gov presently needs, just because "they are so insecure about their own currency"
When the government ban the bitcoin, it means the bitcoin is useful and valuable. People will buy it instead.
Since the begining bitcoin is walking alone without nothing else besides community support, being traders, miners and owners of a portion of bitcoin. Countries may have a positive impact at the price and just.