This diploma thesis analyses the security dimension of South Korea's foreign policy. This analysis is lead by the tools of realism theory: security dilemma, arms races and definition of the state as the main security actor. These tools are considered to be more suitable for the explication of this topic than the tools of social constructivism represented by the so called Copenhagen school and above all its security complex theory. The aim of this thesis is to prove that in the security area of South Korea's foreign policy, security is still viewed in the traditional realistic sense of a one-dimensional military-political security rather than the multi dimensional view of security prevailing in the international relations area since the Cold War end. In this thesis, South Korea's role in the international system is depicted with the emphasis on the security field from the beginning of the 20th century to the contemporary era. Furthermore, the close security area (East Asian region) and direct security area (North Korea) of South Korea are examined. The last chapter consists of an analysis of official government documents concerning the security dimension of current South Korea's foreign policy.

This thesis presents a discourse analysis of American perceptions of Russia in their historical and contemporary context. Through the linguistic construction of security offered by the Copenhagen School of Securitization, we can trace the socio-political development of Russia as the threatening other in the American discourse. This thesis has demonstrated the consistency of linguistic devices in the American Russia discourse from the 18th century to the Crimean Crisis, and has identified specific linguistic packages which securitizing actors unpack according to their preferences and goals in a given situation. This thesis also demonstrates that the resecuritization of a previously desecuritized object may occur through the use of preexisting discursive devices that play on existing elements of the national consciousness. Keywords Resecuritization, Securitization, United States, Russia, Socio-Political Discourse, Crimean Crisis, Copenhagen School, Obama Administration, Vladimir Putin Range of thesis: 121 pages, 34,048 words, 240,229 keystrokes.

The Biden-Harris administration’s discussion of climate change is analyzed during the transformative time of the administration’s first hundred days in office. The theoretical framework of the Copenhagen School of Security Studies (CS) is used to develop the coding frame to perform a qualitative content analysis of empirical material consisting of speeches and other documents of the administration. Several securitization moves have been identified and climate change has been presented as a security issue and an existential threat by the Biden- Harris administration. A wide range of referent objects are identified, which is the people and things presented to be threatened by climate change. The whole world, ecosystems, the American people and future generations are a few of the identified referent objects. International and national solutions are presented, though the solutions are not interpreted as extreme measures as discussed by the CS. Therefore, this study supports the critique of a too narrow definition of securitization by the CS.

This Master's thesis dealt with securitization attempts related to the planned construction of a new reactor at the Dukovany NPP. Therefore, its aim was to find, analyse and explain securitization speech acts associated with the planned reactor, in the period from summer 2015 to December 2020 using the critical discourse analysis approach. The results show that securitization speech acts of this kind do appear in the Czech public sphere and are articulated mainly by four groups of actors: representatives of Austria, Czech environmental NGOs, Czech governmental representatives, and Czech political opposition. These actors have different goals: to stop the construction of the reactor, to implement the construction of the reactor, or to influence the way in which the construction will be implemented. One case of successful securitization was found in the outcome: The Czech government was able to enforce extraordinary measures that deviated from standard democratic processes using security-based arguments. Their goal was to implement the construction of the reactor. It remains to add that the research also revealed three important functional actors who co-created the discourse: the BIS secret service, the SÚJB nuclear safety office and the company ČEZ.

[pt] O objetivo da dissertação é apresentar a contribuição da Escola de Copenhague para a área de estudos de segurança internacional. Para tanto, será discutida a história da área de estudos de segurança, o contexto histórico no qual a Escola é fundada e por fim, as críticas feitas às teses formuladas por esta. Entretanto, creio que no fim desta dissertação, será possível afirmar que além desta Escola ter contribuído para o desenvolvimento de uma importante perspectiva na área de segurança, será possível sustentar que sua contribuição também se estende para a área de teoria das relações internacionais. / [en] This dissertation seeks to introduce the Copenhague School s contribution to the area of international security studies. It does so by discussing the history of security studies, as well as the historical context in which the School was founded. It will also be necessary to analyse the main concepts and theoretical perpectives developed by the School. Thereafter, it shall present the criticism levelled at the School s theoretical and conceptual perspectives. At last, it will become clear that the School s contribution has surpassed the area of security studies since it has also contributed immensely to the area of international relations theory.