Thank you now I feel more educated.
1. Conclusion 1: Not all slavs use the Cyrillic alpaphet. I didn't know that.
2. Conclusion 2: We have a separation from the other Indo-europeans in 4000 BC. So in a sense Russians and Europeans have the same old historical roots. We have a separation of the old languages to сentum/satem languages.
3. Conclusion 3: The word tsar comes from the word ceasar. First by the name tsar was Ivan the Terrible.

Perhaps you think that they teach us this things in our schools in Europe.
Not at all. The only thing we are taught for Russians is about the Russian-Japanese war in 1905, the revolution of 1905, the revolutions of 1917 - 18, the civil war, the role of Soviet Union in WWII and of course the Cold War. Nothing else. This forum should provide more historical facts if Russian history for foreigners.
We don't want just to learn the language. We want also to learn the mainstream Russian history (i.e not opinions).

P.S. What people in FYROM believes is just their problem. By the way they also believe that Cleopatra was Slav. Borrowing the history of other nations as I understood is a common practice for nations that don't have rich history. If you don't have history you don't steal it ... you just try to create your own.