Bitcoin is only banned in 2 or 3 small countries that nobody cares bout. and in the rest of the world, specially the big developed countries bitcoin is not only banned but also recognized as a legal thing.

Russia has never banned bitcoin, in fact they have the biggest conferences each year taking place in Moscow (the capital) about bitcoin.

China has never banned bitcoin. their central bank even issued an statement saying "it is legal for any person to buy, hold, trade and use bitcoin"

same goes for other countries. Japan for example, has announced bitcoin to be a legal currency.

I agree with pooya87 & Dudeperfect.
These countries merely put some kind of "restrictions" in dealing with BTCs & not ban the use of it.
Because in reality, it would be a tough tough move for them to even regulate the utilization of bitcoin
as there's no one governing it.

Your title is misleading,you should change it.
Even if some countries ban bitcoin,the people in those countries will continue to use btc.
Bitcoin was restricted in Russia but thousands of russians were using btc despite the restrictions.

If they can't ban it. Why there's country that can ban it? They can banned it, but they can't stop bitcoin. They can't stop it because many people see it that this bitcoin has a good potential.

Bitcoin is already a global currency , Secondly I want to you that in China , ban of bitcoin is about impossible because  the CHINA is the mazor country who is bitcoin genrator through mining and also have bitcoin bank and officially the government of the China declared bitcoin as legal thing and nothing is bad to use it .
So bitcoin is already a global currency but its user are very less according to the population of the world .
So probably it will take much time to became officially global currency  .

What is the source of this claim 
China and Russia actually love to use bitcoin and china is the heaven for bitcoin miners. No any country have banned use of bitcoin, if some government want to ban than they can just ban local bitcoin trading platform. Nobody can stop/ban bitcoin transactions and nobody can shutdown whole bitcoin network.

Op you have got all your facts entirely wrong and some one has misled you really badly. Russia has never banned Bitcoin, if you Google you can read about the conferences that takes place. China can be considered the mother of Bitcoin they have never banned it, if you are referring to the crackdown on exchanges on China that phase is over and Bitcoin has long moved on to it. Do you know that a School in India accepts Bitcoin, swizz accepts Bitcoin as payments, you can book a cab using Bitcoin in Italy I suppose, there is a online mall also. If you put a demographic picture you can see Bitcoin is used by each and every country now so my advice would be to Google such stuff or just browse through this thread sections.

Well bitcoin is banned in some countries but they can still used it through TOR or something like that,
I think that government doesn't really accept bitcoin since they can't control it and they don't have profit through it.

Maybe there should be justified I think. Russia was ever banned the use of bitcoin but at the end of 2016 they accept bitcoin, and bitcoin far as I know in China are not banned fully but if the banks and financial companies using Bitcoin was banned. And now has begun a lot of countries that accept bitcoin, so in the future bitcoin can grow and become global.

China and Russia didn't ban it, so we have no worries yet. The countries that made it illegal are too small to affect us in any way. Yes, the two countries making Bitcoin illegal would mean a big, BIG change (the price would freefall) but I don't see that happening.