Kalmyk Khanate
In the first half of the 17th century, Kalmyks formed the Kalmyk Khanate in the Lower Volga and under Ayuka Khan conducted many military expeditions against the Crimean Khanate and Nogays. By becoming an important ally and later part of the Russian Empire and taking an oath to protect its southeastern borders, the Kalmyk Khanate took an active part in all Russian war campaigns in the 17th and 18th centuries, providing up to 40,000 fully equipped horsemen.