WI:Slavic Migration to Sassanid Persia

What if Some of the Eastern Slavs migrated to Sassanid Persia and pillaged it at the same time as the Caliphate invades Persia, ITTL there will be no expansion of the Slavs to the Balkans.
 
Personally, the Slavs may only reach as far as Central Asia, but other than that the Huns or Goths could realistically be able to play the Varangian role to the Slavs.
 
What if Some of the Eastern Slavs migrated to Sassanid Persia and pillaged it at the same time as the Caliphate invades Persia, ITTL there will be no expansion of the Slavs to the Balkans.

It's too far a migration too late. The Slavs were pretty much entrenched where they were- there were not going to be any more great migrations.
 
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