Somewhere Turkic "addition" prevail
The most common haplogroups among native Tatars are N - commong among Finns and R1a - the same as among Slavs. Only 5.7% of them have C haplogrop and 1.9% - O haplogroup, which are common among Mongols. Originally (before Mongol conquest) Russian Tatars were known as Volga Bulgars and European-like appearence prevailed among them.
eupedia.com/forum/threads/31231-Y-DNA-Haplogroups-in-Tatarstan
And Volga Tatars is the largest Turkic group in Russia.
Haplogroups among native Russians:
I: Nordic (Northwestern European) Origin. The I1 lineage likely has its roots in northern France. Today it is found most frequently within Scandinavian populations in northwest Europe and has since spread down into Central and Eastern Europe, where it is found at low frequencies. The Vikings belong to this Haplogroup and they were among the earliest settlers of Western Russia, Ukraine, and Poland. 17% of modern day Russians have Haplogroup I or sub-haplogroups I1 and I2.
R1b1: Western European Origin. This lineage is also the haplogroup containing the Atlantic modal haplotype. Celtic people belong to this Haplogroup and they were among the earliest settlers of Russia. 7% of modern day Russians share this origin.
familytreedna.com/groups/russian-dna/about/results