”Two Sources of the Russian Patrilineal Heritage in Their Eurasian Context” Balanovsky at al. 2008.But the result can be interpreted also differently—it lends credence to those theories, which suggest that early Common Era Zarubintsy and Chernyakhov cultures, extending from the upper-central basins of Prut to Don, used already Slavonic languages—i.e., Slavic-speaking tribes were present in a considerable part of the later southern-central part of the historic Russia considerably earlier than better-documented Slavic migrations in approximately the 6th–9th centuries. It could then explain why there is a remarkable patrilineal continuity within West and East Slavonic-language speaking populations, although there are still signs of some admixture of the central-southern Russians with Finnic-speaking (or Baltic-speaking) populations, testified by NRY hg N. There is also an alternative explanation: Time depth of R1a (e.g.,4) might well be considerably older than separation of Indo-Iranian and Slavonic languages (and their speakers) from common Indo-European source,38 and the shared Y chromosomal ancestry might therefore antedate their linguistic differentiation.
There are many reasons to believe that Slavic types of R1a1 expanded much earlier than 6th–9th centuries.
Balanovsky thinks that Zarubintsy and Chernyakhov cultures, extending from the upper-central basins of Prut to Don, were already using Slavonic languages.
R1a1 could have expanded even earlier i.e. with IE before separation of Indo-Iranian and Slavonic languages (and their speakers).
But Indo-Iranian R1a1 is different and absent in Europe and their language probably originated in Asia around BMCA.
Therefore the hypothesis that “the whole temperate zone of Eastern Europe (from Poland to Wolga - large part of the former Corded Ware territory)” was populated by Slavic type of R1a1 and various Proto-Slavic speaking groups in the Bronze Age is very likely. We need aDNA to make sure.