1
BTW Svyatoslav and Rus' didn't destroy Khazaria alone. They were in alliance with the Oghuz Yabghunate. Rus attacked from the west and Oghuz from the east and that's how Khazar fell.
History of Civilizations of Central Asia (vol.4,part-1) - S.G. Agajanov
Actually most of the job done by Oghuz in fact
Bookmarks