What country is not a member of the European Union although EU members surround it what country is it?

The following countries are surrounded by the European Union but are not part of the EU:

Switzerland + Liechtenstein, Andorra, San Marino and the Vatican City.

Monaco borders on France (an EU member), but has a coastline so it is not completely surrounded.

The Russian province of Kaliningrad also borders only on EU countries, but also has a coastline as well.