Christian Carpelan and Asko Parpola have argued for European (Abashevo culture) origin for Seima-Turbino phenomenon in their long, joined article in the book Early Contacts between Uralic and Indo-European: Linguistic and Archaeological Considerations.
According to them, there was of course independent bronze work in Altai region, but it only spread to Europe after the Abashevo-based trade network took control of Altai bronze industry. They think the Seima-Turbino bronze traders were Aryan, but the total distribution from Altai-Sayan to Kama, Volga-Oka and even Finland fits much better to the area of Uralic languages. True, the Abashevo culture seems to have been Aryan, but it is more probable that the language connected to Seima-Turbino network was Uralic (see pages 49-51, in Finnish):
http://www.sgr.fi/susa/92/hakkinen.pdf

