Few days ago there was a news, that Bitcoin will be legalized in Russia in 2018. So, I can't understand - if it can be legalized, does it mean that Bitcoin can be banned? If it's true - how does it possible?
It is more of a rumor that real news, Russia is totally unpredictable country, they changed their stance towards bitcoin and cryptocurrencies many times.
Bitcoin can't be banned per se, but bitcoin usage can be seriously hindered, there won't be any official business/services accepting bitcoin payments and it will be really hard to exchange bitcoin to rubles.
Maybe there were some precedents, when government can block Bitcoin (any other cryptocurrencie) ? Cause if my understanding is correct, they need to disable all the Internet to stop Bitcoin.
Official bitcoin ban will discourage general population. Bitcoin adoption will be halted and bitcoin's name slandered.
It will be still be possible to use bitcoin but you won't be able to do it openly.