Would "Deutschland" and "Rußland" be "Nachbarn"?
Not in the sense that they share a border, no.
Well, I have neighbors two doors down.
But not "Deutsch l a n d" and "Ruß l a n d"
No, I live in America. My neighbors a few doors down would be Belize and Costa Rica and such.
Not today, but they were, between the late 19th century and early 20th century.
3rd Reich, anyone ? :D
Then in 1939..