Chuvash despite being Turkic have no connection to other Turkic ethnicities in Europe.
Russians are almost equally Slavic and Finnic.
Genetic distance between Finns exists from West to East, maybe due to Swedish and Russian colonization respectively.
Balts mostly form their own group but are related to Finns.
Scandinavians are not very homogenous, particularly Swedes who tend to cluster with SW Finns.
West Germanics (Brits, Dutch, Germans) + Celts, Danish and Belgians are very closely related.
The French bridge the gap between the Germanic Central European and the Iberian cluster, which makes perfect sense considering geography.
Hungarians have their loose cluster with Slavic and Germanic influences.
Romanians are indistinguishable from Bulgarians, probably reflects their shared history.
Iberians have a strong cluster like CE Germanics. Basques however are more distant and they cluster together regardless if they're French or Spanish basques.
Sardinians like Chuvash are isolates.
Despite what /pol/ tells you North Italians are pretty similar to Spaniards.
There's quite a bit of genetic distance between North and South Italians, with Tuscans bridging the gap.
Greeks are by far the most spread out ethnicity.
Jews, especially Ashkenazi are indistinguishable from South Italians. Morrocan Jews may lean towards North Africans.
Despite centuries of colonization by Romans and Arab North Africans are their own distinct
yet loose cluster.
Cypriots are more Middle Eastern than Greeks.
Levantines have their own tight cluster.
Arabs have their own loose cluster, and Bedouins seem to have little genetic homogenity.
Iraqi, Iranian and Yemeni Jews are indistinguishable from their geographical neighbors.
Turks are more Armenians and Caucasian than Greeks.
South and North Caucasian groups seem to form separate clusters.