Russian Jews: The Confessional Situation in the Late Twentieth Century
The Law of the Russian Federation "On Freedom of Conscience and on Religious Associations" (1997) asserts that Judaism—the national religion of the Jews [evrei]—alongside Christianity, Islam, and Buddhism, is one of the religions traditional to Russia. And this is indisputably so. On various territories entering today into the composition of the Russian Federation (not to mention those that had been in the composition of the Russian Empire and the USSR), Jews settled as far back as the New Era [the time of Christ] and in subsequent centuries (the North Caucasus, Dagestan, the area along the northern coast of the Black Sea [Prichernomor'e] and around the Sea of Azov [Priazov'e]; and the lands that entered into the Khazar Khanate, where Judaism was the state religion in the eighth-tenth centuries).
Link to article (paywalled), Russian Jews: The Confessional Situation in the Late Twentieth Century
Russian Jews: The Confessional Situation in the Late Twentieth Century. 2001: 31-55. https://archive.jpr.org.uk/10.2753/AAE1061-1959400331