Most of the northernmost parts of Europe were populated by Siberian-admixed Uralic populations until the Slavic expansion. Almost half of the area of what is today Sweden and Norway used to be part of Sápmi. Even the areas of Moscow and St. Petersburg used to be populated by Uralics.
The indigenous population of most of Northern Europe in the strict sense (which doesn't include southern regions like the British Isles or Germany) is Uralic. Komis are genetically typical indigenous Northern Europeans.
Saami aren't borderline northerners either, but they are even more northern than Scandinavians, in the same way that North Russians are more northern than Central Russians. Even today, with the exception of the Icelandics, the northernmost populations of Europe all have about 10% or higher Mongoloid admixture: Saami, Finns, White Sea Karelians, North Russians, Komi, and Nenetses. Norwegians, Swedes, and Russians (as a whole and not just North Russians) are not as northern, because their center of population is located further south.
Edit: I modified the map below so that it just includes Northern Europe. You can see that the indigenous population of about 80% or more of Northern Europe is Uralic.
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