Then are Kola Saami or East Karelians not Northern Europeans either?
If Komi Republic would be an independent country, its capital (Syktyvkar) would be the second northernmost capital of Europe after Reykjavik. The southernmost part of the Komi Republic is at approximately the same latitude as Stockholm. Like Finland, the Komi Republic is almost entirely part of the boreal zone, but the population of Sweden is mostly concentrated in the temperate hemiboreal zone.
If Brits are Northern Europeans, then so are Russians. Maybe 10% of the area of European Russia is further south than the southernmost part of England, and it includes many republics with an indigenous majority: Kalmykia, Dagestan, Chechenya, Ingushetia, North Ossetia, Kabardino-Balkaria, and Karachay-Cherkessia.
Moscow is at about the same latitude as Copenhagen, and the center of population of Russia is further north than Moscow.
Even Izhevsk (the capital of Udmurtia), Yoshkar-Ola (the capital of Mari Land), Cheboksary (the capital of Chuvashia), and Kazan (the capital of Tatarstan) are all further north than Copenhagen.
I think even Chuvashes are genetically more northern than North Germanics, because they have much lower EEF / West Asian admixture.
If Northern Europe is defined as the regions of Europe further north than the southernmost point of Denmark (latitude 54.56), then the 20 largest cities of Northern Europe are the following:
(population within city limits listed by Wikipedia (millions);latitude returned by Google Maps;city)
12.4;55.6;Moscow
5.28;59.9;Saint Petersburg
1.26;56.3;Nizhny Novgorod
1.23;55.8;Kazan (Tatarstan)
1.12;54.8;Ufa (Bashkortostan)
1.05;58.0;Perm
0.97;59.3;Stockholm
0.67;59.9;Oslo
0.65;60.1;Helsinki
0.63;56.8;Izhevsk (Udmurtia)
0.61;57.7;Yaroslavl
0.60;55.7;Copenhagen
0.60;55.9;Glasgow
0.58;57.7;Gothenburg
0.54;54.7;Ryazan
0.53;55.7;Naberezhnye Chelny (Tatarstan)
0.50;58.6;Kirov
0.49;56.2;Cheboksary (Chuvashia)
0.48;55.9;Edinburgh
0.48;54.7;Kaliningrad
Using the same definition of Northern Europe, you can see that most of Northern Europe is part of the Uralic domain, even though most of its area was lost to Russians and the Norse:
https://indo-european.eu/maps/medieval/
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