While the Scythians did range into Siberia, Amnya is north of the steppe by something like 1500km, and I don't think even the Andronovo horizon ever extended th

While the Scythians did range into Siberia, Amnya is north of the steppe by something like 1500km, and I don't think even the Andronovo horizon ever extended that far north. Also, you're off by a few millenia: Indo-Europeans didn't emerge from the Pontic-Caspian steppe until the 4th millenium BCE.