Jewish Khazaria thrives until the beginning of the tenth century, when the Kievan Rus' finally succeed in crushing Khazar power.

The campaigns of Russian prince Sviatoslav I of Kiev precipitate the collapse of two great powers of Eastern Europe—Khazaria and the First Bulgarian Empire—and make Kievan Rus' the largest state in Europe.

Sviatoslav's invasion of Bulgaria refers to a conflict beginning in 967/968 and ending in 971, carried out in the eastern Balkans and involving the Kievan Rus', Bulgaria, and the East Roman Empire.

Constantinople instigates the Rus' ruler to attack Bulgaria, leading to the collapse of the Bulgarian state and the occupation of much of the country by the Rus'.

The ensuing direct military confrontation between the Rus' and Constantinople ends with an imperial victory.