A reader alerts me to this article in Russian, but you can use Google Translate to get the gist of it. Some interesting bits (note that "pit"=Yamna):
I can not ignore the question I now have is particularly exciting - the origin of the Indo-Europeans. Community Indo-Europeists animatedly discussing just appeared as a preprint work of David Raika and his colleagues discovered by studying the genomes of people Neolithic and Bronze Age that a decisive influence on the genetic landscape of Europe has had a migration of people pit culture to the north and west in the middle of the III millennium. BC .e. As a result, according to geneticists, there was a population associated with the Corded Ware culture, and from it are the origin of the later Indo-European. By the same conclusions about the same time came the other team's leading geneticists led by Eske Villerslevom.
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A steppe, we thought had long been a special world, and differs sharply from the Middle East, and from the European. Migration from there - so it seemed - were mainly directed not to the west and to the east, along the steppes, in the direction of Central Asia, which the ancient Indo-Europeans, Afanasiev media culture (descendants of the people of the pit culture or their ancestors steppe) reached no later turn IV- III millennium BC. It is now confirmed and the group Villersleva.
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By the way, it also happens that paleoanthropologists prompted geneticists way of research - and turned out to be right. As it happens, for example, with native Okunevskaya culture of South Siberia. When 20 years ago, we found that craniologically (by a combination of traditional measurement and we proposed new informative features of the structure of the cranial sutures and holes) okunevtsy - "cousins" of American Indians, few believed us. Firstly, in okunevtsah ever seen Caucasoid-Mongoloid Métis like the Kazakhs, and secondly, the ancestors of the Indians withdrew from Siberia to the New World at least 10 thousand. Before the Yenisey there Okunevskaya culture.

Eske Willerslev Now and his colleagues have fully confirmed our conclusion. They confirmed the close relationship between the carriers and the pit Afanasiev cultures and migration ancestors sintashtintsev and Andronov from Europe in the Urals and further to Siberia - but this is already a long time, few archaeologists and anthropologists doubted.
I hope more details will appear soon on what promises to be a very interesting new study. The author seems to be referring to his theory of a relationship between Okunev and Amerindians, and I'm wondering if this is simply "Ancient North Eurasian" ancestry or an even more specific link. Any Russian readers who can dig up more information are invited to post in the comments.