X-Nico

A History of Warfare

It also talks about the conquests of the 'horse peoples', first under the Assyrians, then the Achaemenids, Parthians and Sassanids; then in the 7th century the Arabs conquer a lot of territory, followed by the Mongols under Genghis Khan and finally the last of the horse peoples under a Mongol named Tamerlane, who unleashes massive carnage and destruction.

see also

Islam in Russia

The first Muslims within current Russian territory were the Dagestani people (region of Derbent) after the Arab conquests in the 8th century.