>>509582498
I didn't want to be that guy (you) because I really only care about programming, but you're right.
I2 and R1a haplogroup is confirmed to be of Yamnaya culture, but it was also heavily present in Vinca culture, especially in central Balkan, Panonia and Dinaria (not same terms).
However, horse domestication, raw foreign-species milk consumption, wheel (yes, it was reinvented few times in different parts of the world), it all traces back to Yamnaya and our haplogroups here.