Why did the Khazar Kaganate and the Volga Bulgaria accept Judaism as the state religion, and the prince of Kievan

Why did the Khazar Kaganate and the Volga Bulgaria accept Judaism as the state religion, and the prince of Kievan Rus Vladimir the Great preferred the introduction of Christianity?

Russia adopts Christianity in order to strengthen the authority and increase the importance of Russia in the European arena; Khazars and Volga Bulgars accept Judaism with the aim of opposing their states to the Christian world, and Byzantium, in particular.

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