All throughout the existence of the USSR, there was always the claim that the number of USSR citizens who died in WWII was 20 million.
Lately, I am seeing a persistent claim that that number was 27 million. That's quite a difference. And it's never presented as an estimate. People bring this number up with decimal-point precision when discussing WWII.
I am NOT, NOT, NOT, NOT asking if the claim is true.
I am curious what is the origin of this "27.x million" claim. What is the FIRST source for it. Was it some scholarly revision which did the 1st work and gained traction?
I am sure people can point to a lot of supporting sources which confirm it, but that's not what I am asking. I am asking about what is the 1st source for it.