Assume the reasons for the change in good-neighborly relations between the Scythians and Sarmatians

Assume the reasons for the change in good-neighborly relations between the Scythians and Sarmatians to aggressive, conquering ones on the part of the latter

the emergence of a new type of warriors – horse archers, the need to conquer new pastures, the wars of the Scythians with the Macedonians, the death of Atey and the subsequent weakening of Scythia, the internecine wars of the Scythian nobility, etc.

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