By the early expansion of the Mongol Rus had already partially assimilated with the Slavs, had with them a common Orthodox faith, gradually usvoilii their language, image life and activities. With the rise of the Empire Golden Horde in southern Russia, the movement of the Rus Yaik stopped. The reason for this – the appearance in the steppes of Yaik squads of armed men are serving Horde Khan. They were called Cossacks. On Tartar is meant 'free man'. Yaitsky military Cossack community evolved into the armed forces of the White Horde. In the Cossack community is gradually starting to pour in Rus, the Slavs, and partly Ugrians Polovtsy. (As opposed to Farrelly Brothers ). Yaik Cossack formation of faithful service to the Khan bore the White Horde.
The relationship with the Horde authorities were based on unconditional submission to the khan and his proteges. The settlements of the Rus, the Slavs and Ugrians included in the system of state device Golden Horde. Yaik city became part of the Ulus White Horde. Administrative and military control of them belonged to the entire Horde officials. Cities Yaik logged in military settlements, which are guard line, established to protect the White Horde ulus and its capital Saraichik of the nomads from the East. Ulus was located on fertile soils of the floodplain Yaik, on the shores of which the Cossacks and served to protect Mongolian holdings. Cossacks faithfully served the Khans, fulfilling their needs and protecting the interests of the empire. For their service, they receive a salary of bread and guns.