I don't think L21 arose further east than Central Europe, but the Beaker Folk have a pretty obvious connection to the Pontic steppe via their characteristic bell-shaped Beaker pottery and their horse-riding, pastoralist lifestyle. There probably is also a connection between the Kemi Oba culture of Crimea and the Stelae People. The latter appear to have spread from the north shore of the Black Sea across Europe all the way to Iberia and Brittany.
So, whether or not L21 itself arose in Eastern Europe, which I doubt, P312 or perhaps L11 may have arisen there, and both of those are ancestral to L21.
So, whether or not L21 itself arose in Eastern Europe, which I doubt, P312 or perhaps L11 may have arisen there, and both of those are ancestral to L21.
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