Don Cossacks
Don Cossacks reached lower Don, Donets and Azov by the 1580s and thus became the north-eastern neighbours of the khanate. They attracted peasants, serfs and gentry fleeing internal conflicts, over-population and intensifying exploitation. Just as Zaporozhians protected the southern borders of the Commonwealth, Don Cossacks protected Muscovy and themselves attacked the khanate and Ottoman fortresses.