They're indigenous to Europe and that's how the mutations and natural selection caused the population to go.

The relevant bit, though, is

... Palij, now 94, remains a free man because no one else wants him, either. As Rosenbaum told The Daily Beast in an email, “Unfortunately, the governments of Germany, Ukraine and Poland have declined to admit Palij and no other nation has agreed to accept him.”

Where they Nazis? It has been going on for 17 years. It is a little more complicated than that.

and then couldn't remember which countries wouldn't let him back in and couldn't remember his name and the details. I don't understand why Germany, Ukraine and Poland won't accept him and the article doesn't say.

I don’t see him being anything but a financial burden. I’m not surprised other countries won’t accept him.