Ygorcs
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Silk road has existed in Roman times and most likely before https://www.britannica.com/topic/Silk-Road-trade-route
Alexander campaign went via Lydia (where there are same number of N carriers today as in Finland) to India (where N has 60% of brahmans) https://www.bible-history.com/maps/alexander_campaigns.html
I haven't noticed N between finds of Большой Олений остров
Mitochondrial haplogroups C*, C5, U5a, U5a1, U4a1, Z1a, D* and T* were identified in fossil remains of the population. According to scientists, the greatest genetic similarity with samples from the Island was shown by modern Siberian populations, mainly in the Yenisei River basin. Presumably, the population of the Island arrived to the Kola Peninsula 3,500 years ago from Central Siberia, https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1003296
It's more likely N spread from South to North via Siberia rivers https://en.wikipedia.org/wiki/Siberian_River_Routes#/media/File:Siberiariverroutemap.png
No way Brahmins have 60% N frequency. That's just totally incorrect. As for numbers, I'll just ignore that. Numbers mean nothing when we know the human population increased tremendously in the last 2000 years and it did so in different paces from region to region. Proportions do matter. As for Lydia, it seems pretty likely that most of the N there arrived with the Turks, as similar clades of N are found in Central Asian Turks - so it's quite recent in that region.
Yes, the earliest N1c in Fennoscandia was found in Bolshoi Oleni Ostrov. And it's much older than any influence of the Silk Road in Europe. Read: https://www.biorxiv.org/content/early/2018/03/22/285437
Additionally, N1c was also found in a DNA sample from the 3rd millennium BC (~4000 years ago) in Serteya, Russia, near Belarus and Latvia. Again, that presence of N1c exactly in Northeastern Europe where it's most frequent now existed way before any of the events you're talking about took place. Read: https://www.academia.edu/9452168/Ar...azurkevich_A._Polkovnikova_M._Dolbunova_E._ed
This is the distribution of the N haplogroup samples found in the ancient DNA analyses as of now. The distribution of the haplogroup was clearly very "northern" and mainly Siberian/North Asian... Its first samples (not the N1c found in Europe, though) are found in Neolithic Liao civilization, i.e. northeast China near the Russian border. And of course it just had to move westward and be "lucky" or successful to expand a lot in Northeastern Europe. I wonder why you feel the need to find much a more convoluted (but presumably more "fabulous") explanation for what must've happened.
No ancient sample with N haplogroup was found anywhere in West Asia and in all of Europe before 3500 years ago, and when it finally appears it's near Scandinavia and associated with heavy Siberian autosomal input, not anywhere else, certainly not in Lydia (Turkey) and other parts of the East Mediterranean. If N was strongly associated with the Silk Road, we'd never expect the regions most influenced by them to be located in the northeasternmost portion of Europe, because that was at best an utter periphery to those traders and travelers who mostly passed through Central Asia with the Mediterranean Basin as their main destination. You seem to be overestimating the demographic impact of traders too much.
Yes, of course N seems to have come to Northeast Europe from the more habitable parts of Siberia (lower latitudes), but that does not mean at all that the Silk Road had something to do with it. It seems to me that you just can't accept a less "glorious" or "civilized" origin for the spread of your haplogroup, God knows why... But the real likelihood is that N1c predates any civilization in Northeastern Europe and any and was already a "northern haplogroup" coming from the east (Siberia) to the other side of the Urals and expanding later from somewhere near the Urals with a new mixed population, mostly of European descent but also with some Siberian ancestry. The autosomal linkage also suggests that the population that carried it was not "from the south" at all, it was just another Siberian population closely related to other taiga dwellers. And that may have happened before 3500-4000 years ago. The Silk Road and other southern trade routes have nothing to do with its arrival in Europe and subsequent expansion.
My advice is: read the papers and the findings (especially ancient DNA) and try to derive conclusions from the evidences, not the contrary, which is trying to find evidences to prove your preconceived conclusions.