Being active in the internet I often meet these ideas. Russians often have opinion about eastern conquerors that populated Finland. Westerners have another weird habit; they dig again and again 80 - 150 years old dusty papers to prove something. We have in Finland our own stories, sometimes supported by our researchers, unfortunately. Common for those people is denialism, they don't want to use up-to-date and comparable scientific results and if they use available new data they will always find a loophole how to support those 80-150 years old dusty papers. One of those ideas is to prove that the Finns came from the far east and so East Finnish people have to be an evidence because they are the most eastern Finnish group..
I made a series of Dstat-statistics to see where the East Finns locate on the east-west axis. I have genealogically proven samples from all Finnish regions and also classified samples from the 1000 genomes project.
East Finns are closer Southwest Finns than they are from Karelians, despite of the historical Swedish connection of Southwestern Finns.
I made more comparisons to see a bigger view and I can cast a challenge. If someone can give any non-Finnish sample group being closer East Finns than East Finns are from Southwest Finns, I will publish the results and give all kudos to her/him. Only group on the Russian side I rule out is Ingrians who actually are East Finns who migrated to Russia during the historic era.
FIN-Southwest-proved is from the seaside of Finland Proper and consists of 5 samples.