The Nenets people are Asian (Mongoloid), while most of the speakers of Finno-Ugric (Uralic) languages are European: Finns, Hungarians, Estonians.
Clearly, at some point, their ancestors lived far away from each other, then they came into contact, and the ancestors of modern Nenets people gave up their language to speak a Finno-Ugric language, yet they managed to remain a separate people.
That hasn't been too unusual since the age of empires, but I think it was very uncommon before that, which is why this seems interesting.
Note: According to Wikipedia, Finno-Ugric is an acceptable synonym for Uralic:
The term Finno-Ugric, which originally referred to the entire family, is sometimes used as a synonym for the term Uralic, which includes the Samoyedic languages