Relations between the EU and its neighbour countries and regions are very important for either side. One of the topics which joins them is the energy resource issue. Daily, millions of barrels of oil and billions of cubic meter of natural gas flow through this area into Europe. This diploma thesis deals exactly with this matter, e.i. European Union's energy security. It is a very topical, discussed but above all for the EU important theme. The purpose of this thesis is to connect the conception of EU's energy security through the European Neighbourhood Policy, e.i. the policy which the EU has established to create stability and prosperity with the neighbour regions of North Africa, Near East, Eastern Europe and the Caucasus states. The outc...