Fatyanovo-Balanovo people were similar to Corded Ware people - mixture of steppe Indo-Europeans and EEFs
Russia north of the forest line was settled ~9700 BC, & groups there culturally fragmented by ~8500 BC. The Hunter-Gatherers that settled the region were fairly typical EHGs.
Yamnaya people were a mix of EHG & CHG. Corded Ware people (ruling from Tatarstan to Belgium) were mostly Yamnaya in ancestry, but had some EEF ancestry, mostly female.
Fatyanovo-Balanovo culture men were of a male lineage now mostly found in Central Asia & India rather than in Europe.
Fatyanovo-Balanovo people were perhaps ~20% EEF in ancestry, while Corded Ware people from Baltic were a bit more than 11% EEF.
Baltic & Central European Corded Ware people would later mix with EEFs more when they adopted the Bell Beaker cultural package in the second half of the 3rd millenium BC: https://twitter.com/Peter_Nimitz/status/1256738030997520391
hunter-gathers of Russia's north prior to Indo-Europeans were brown skinned with brown eyes. 1/3 of Fatyanovo people had blue eyes or blond hair. None of the HGs and 10% of Fatyanovo could drink milk into adulthood.
Fatyanovo people introduced farming to their region. They arrived in the region at a similar time that the Corded Ware people arrived in the Baltic & southern Fennoscandia. The prior hunter-gatherers didn't mix with Fatyanovo-Balanovo people.
My guess is the hunter-gatherers like Volosovo & Comb Ceramic people were pushed into marginal lands & wiped out - Fatyanovo-Balanovo farmers took over their hunting grounds.
source of this thread is "Genetic ancestry changes in Stone to Bronze Age transition in the East European plain" https://www.biorxiv.org/content/10.1101/2020.07.02.184507v1