I think the most interesting thing is the map:
As you see, Central Asia is almost empty of any Indo-European speakers except some southern parts, it seems there were almost none of them in the eastern Europe more than 500 years ago, that is also interesting about Scandinavia and Iberia.
Anyway I think it is a possible theory, the earliest known Indo-European peoples lived in a region from the northwest Iran to the southeast Europe, probably from this region, Indo-european languages were spread to the west and the east.
Edited by Cyrus Shahmiri - 24-Aug-2012 at 09:45