Eastern European restaurant near Naperville
Not aware of any of these in or near Naperville. Closest ones are Bohemian Garden on 75th Street in Downers Grove, Bohemian Crystal in Westmont just off Ogden east of Cass. An alternative suggestion is to try Smilga Restaurant at 2819 83rd St in Darien -- a Lithuanian restaurant worth a visit. Try their cepelinai, a large potato dumpling stuffed with meat and served with bacon and onions cooked in butter.
There is apparently now White Eagle, a "European Deli" in Naperville just east of Route 59 on North Aurora Road a few doors east of the Texas steakhouse. They offer sandwiches, but I have no idea what else.