Уральцы были круче ИЕйцев? 
The Fatyanovans are Proto-Indo-Iranians.
1. Fatyanovo culture is a part of Corded Ware Culture (Oka-Volga rivers) about 5000-4200 years ago
2. The basis of men of Fatyanovans are men from R1a-Z645-Z93.
3.  Men R1a-Z645-Z93 left Fatyanovo to the east to Andronovo-Sintashta and  after invention of chariots spread all over Asia (Andronovo expansion)
4.  Some descendants of Fatyanovo R1a-Z645-Z93-L657 (this is about 30-60%  of modern Brahmans, a large number of Jats, former Kshatriyas), and  other descendants of Fatyanovo R1a-Z645-Z93-Z2124 (this is about 40% of  burials in Scythian-Sarmatian mounds, as well as many modern speakers of  Iranian languages).
5.  The divergence of the Balto-Slavic and Indo-Iranian branches occurred  about 4200 years ago (Kasyan's work, 2021) just at the time of the  departure of the Fatyanovans (R1a-Z645-Z93) from the Russian Plain.
6.  The major branch of the modern Balto-Slavs related to the Fatyanovans  as fraternal is R1a-Z645-Z283. These men also lived in Corded Ware in  the neighborhood of the Fatyanovans in the Eastern Baltic.
7.  The significant number of Proto-Indo-Iranian loanwords in the Uralic  languages, also indirectly testifies to the interaction between the  Fatyanovans (R1a-Z645-Z93) and the arrived inhabitants of the Netted Ware  Culture (probable Uralic people from haplogroup N1).
We can see the reasons in the languages of both peoples:
Proto-Uralic - *hugrás (strong) - as a self-designation of one of the Ural branches
Sanskrit - उग्र ugrá (strong, fury)
Avestan - ugra (strong, fury)
Proto-Uralic - *orja (slave, servant, southerner)
Proto-Indo-Iranian - *Áryas - as a self-designation of proto-Indo-Iranians
https://sanat.csc.fi/wiki/EVE:orja8.  The departure of the Fatyanovans (R1a-Z645-Z93) from the Russian Plain  was probably connected with the arrival of the Uralians (N1) to the  Russian Plain.
Military  clashes between Proto-Indo-Iranians (R1a-Z645-Z93) from Fatyanovo and  Proto-Uralians (N1) from Netted Ware Culture are also seen in  archaeology (Numerous skeletons from Fatyanovo-Balanovo cemeteries show  evidence of injury, including broken bones and smashed skulls).
Conclusion:  Pressure from new Uralic migrants (N1) most likely forced the  Proto-Indo-Iranians (R1a-Z645-Z93) to leave Fatyanovo for Andronovo-Sintashta.