My grandparents left, and never looked back; neither wiull I.
That is your choice, though lack of freedoms or economy may change that one day.
My grandmother was from Breslitovsk, in what is now Belarus. It was Poland at the time. We have no family there now. Anyone who stayed was killed.
My father's maternal grandfather came from Russia, I am not exactly sure where. He ended up settling in Mukachevo (Munkach in Hungarian) in what was then Austria-Hungary, later Czechoslovakia, the Soviet Union, and now Ukraine. Most of my family on my father's side is from that area. They began leaving for British Palestine (now Israel) in 1926.