As to you, you consider yourself Russian or Pole ?
I consider I'm Moskal. I'm Orthodox and I have moral duties there. I'm happy to be Moscal and I feel gratitude to my Polish-speaking ancestors for migrating here although that was in some measure against their desire. I'm happy they didn't manage to use optation in 1921 although I have documents that they were eager to return and suffered much here. But thanks to that I have such a luck to live in Russia now.
I feel my Lithuanian origin (not of the CROWN although I respect the history of both parts of RP).
It is very uneasy to believe, but even when I knew nothing about my ancestors (that was in secret during Communism) and thought they were Poles, despite that I started spending my vacations in different places of Belarus and tried to learn all the history of this region. I didn't know why.
I visited the regions my ancestors lived or wanted to live (by its beauty) without knowledge that was the Fatherland. I was unable to hear a word unknown in Russia, such as folwark.
So, nostalgia doesn't die with people. It goes to their grandsons and grand grandsons
Bingo, but it started to change, they started to celebrate for example 3rd May Constitution together with us. (this constitution made from Polish-Lithuenian comonwealth one coutry Poland)
An interesting change because Lithuanians today seem to be ethnic nationalists. Although they and portuguese people seem to be best peoples in Europe