I am an academic and was in Lithuania for many reasons, not least academic, to study Lithuania during WWII and after. An American Lithuanian friend gave me the book after I returned. It is a beautiful country. While there, I especially wanted to see everything in Vilnius, the Old Town there, the Jewish ghetto, Vilnius Calvary church, attend Mass at Our Lady of the Gates of Dawn; saw also the Hill of the Crosses and the Shrine of our Lady of Siluva; I got to Kaunas, too, saw where czars spent some of their vacations. And although I went to a wonderful spa ( I believe in Druskininkai) while there and enjoyed Dzukija National Park, most of my time had to be spent in Vilnius, researchng. I am aware of the differentiations you list above and of "citizen collaborators," all  elements of war, conquest and subjugation. But thank you.