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So, my conclusion is that East Slavs and West Slavs didn't have connection with Avar khaganate ?! while pannonian Slavs had, and partially South Slavs.
There is some evidance, i can't find now, that Croats and Serbs are paid by Byzantium to fight Avars, and that's the reason why they migrated from White Serbia/White Croatia towards the Balkans.
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