According to Article 50 TEU (Treaty of European Union) amended by Lisbon Treaty, member states of European Union are granted right to leave this international organisation, and the moment and change is being watching. Since Article “Withdrawal” being approved, except United Kingdom, no member states have the campaign to leave EU. Nevertheless, the European political situation has changed and no one can predict that all the EU countries will be together forever.
Having said that, Lisbon Treaty coexists “Opt in and out” Open Door Policy, and it is doubted whether EU is constrained or loose regime? This paper consists of those parts to study the potential and future political development and situation of European Union— the procedure of access to and withdrawal from EU in context of Lisbon Treaty, and what impact comes up to international politics when the withdrawal of EU member state is in process. This paper is designed to employ Neorealism to analyse the issues of EU’s access and withdrawal, and to apply Single Case Research Design to launch the research.
The contribution of the paper mentions the EU’s world position and European politics if one member leaves the Union, and it would bring the domino effect to affect others to withdrawal as well. The paper discovers that some EU member states would plan to leave the Union before the Treaty of Lisbon enforcement by reason of national interest maladministration or unfair allocation, and even though one EU member state leave the Union, it still has the right and opportunity to cooperate with the Union.
However, the former member cannot enjoy membership right, but it does not serve the EU obligations. The paper concludes that the withdrawal of the EU may not hurt former states’ interest and continue multiple cooperation with EU, but the EU’s world position and international peace and security will drop into the dilemma, and it will not benefit the EU in final.