Nachbarschaft"! *rolls eyes*
What is so strange about this? Russia is in our neighbourhood, diplomatically speaking, with Kaliningrad being only a couple of hundreds of kilometers away.
"Neighbourhood" in diplomatic terms doesn't just include countries that share borders, but ones that are either part of or border a geographic region, political body and so on.
The EU neighborhood program includes countries like Georgia that do not share a border with any EU country.
en.wikipedia.org/wiki/European_Neighbourhood_Policy