I think, most of the time, countries that border each other have similar languages. But I can think of at least a couple that don't.
1. Hungary/Austria: Hungarian is not even closely related to German (Austria's language). It is not even a member of the Indo-European language group that German, English, Spanish, Hindi, Swedish, Norwegian, Ukrainian, and Lithuanian, are a member of)
2. Finland/Sweden: Finnish is very distantly related to Hungarian, and totally unrelated to Swedish.
How has your day been so far?