Medieval Eastern Europe... Rus and Khazaria - neighborhood and irreconcilable enmity, which ended with the destruction of the Khazar Khaganate. How did they build relationships? Why did one country win and the second lose and disappear forever after losing? One of the most mysterious and unsolvable mysteries of our past. The best minds are fighting over her solution, but scientists have not agreed on what opinion of their colleagues should be considered generally accepted.