"Mémoire présenté à la Faculté des études supérieures en vue de l'obtention du grade de Maîtrise en droit - option recherche(LL.M)" / Ce mémoire traite de la contribution du Tribunal pénal international pour l'ex-Yougoslavie (« TPIY ») au développement des sources formelles du droit international public. Il considère, plus précisément, le dilemme normatif entre le droit international classique, polarisé sur l'État et « résorbé» dans une juridicité formelle, et le «droit de l'unité substantiel », codifiant le mythe kantien de la paix par le droit et associant juridicité et légitimité par une intégration de l'éthique dans le droit. L'analyse postule la rétroaction du droit sur ses sources et étudie les courants idéologiques du droit international contemporain à partir de la jurisprudence du TPIY. Le mémoire conclut à une rupture entre le discours rhétorique du TPIY sur les sources, se réclamant du droit international classique, davantage compatible avec le principe de légalité, et les pratiques normatives effectives du Tribunal, ressemblant à un jusnaturalisme moderne, fondé sur des valeurs morales et éthiques. / This thesis studies the contribution by the International Criminal Tribunal for the former- Yugoslavia ("ICTY") to the development of Public International Law. Specifically, it analyses the normative dilemma between sources ofClassic International Law - correlated to the will ofStates, as wel/ as legal formalism - and the "International law ofsubstantial unity" - which codifies the Kantian myth of ''peace by law" and moves the classic idea of legality from formalism to legitimacy by using ethical references. The analysis assumes Law's retroactive effect on its sources and considers ideological movements of Contemporary International Law in the jurisprudence of the ICTY. The thesis concludes to a clash between ICTYabstractfindings related to sources ofInternationallaw and the actual "day-by-day" normative practices ofthe Tribunal. While the first brings into play Classic International Law and the rule of law, the second looks more like a neo-naturalism, fashioned by moral and ethical values.

Ce mémoire traite de la contribution du Tribunal pénal international pour l'ex-Yougoslavie (« TPIY ») au développement des sources formelles du droit international public. Il considère, plus précisément, le dilemme normatif entre le droit international classique, polarisé sur l'État et « résorbé» dans une juridicité formelle, et le «droit de l'unité substantiel », codifiant le mythe kantien de la paix par le droit et associant juridicité et légitimité par une intégration de l'éthique dans le droit. L'analyse postule la rétroaction du droit sur ses sources et étudie les courants idéologiques du droit international contemporain à partir de la jurisprudence du TPIY. Le mémoire conclut à une rupture entre le discours rhétorique du TPIY sur les sources, se réclamant du droit international classique, davantage compatible avec le principe de légalité, et les pratiques normatives effectives du Tribunal, ressemblant à un jusnaturalisme moderne, fondé sur des valeurs morales et éthiques. / This thesis studies the contribution by the International Criminal Tribunal for the former- Yugoslavia ("ICTY") to the development of Public International Law. Specifically, it analyses the normative dilemma between sources ofClassic International Law - correlated to the will ofStates, as wel/ as legal formalism - and the "International law ofsubstantial unity" - which codifies the Kantian myth of ''peace by law" and moves the classic idea of legality from formalism to legitimacy by using ethical references. The analysis assumes Law's retroactive effect on its sources and considers ideological movements of Contemporary International Law in the jurisprudence of the ICTY. The thesis concludes to a clash between ICTYabstractfindings related to sources ofInternationallaw and the actual "day-by-day" normative practices ofthe Tribunal. While the first brings into play Classic International Law and the rule of law, the second looks more like a neo-naturalism, fashioned by moral and ethical values. / "Mémoire présenté à la Faculté des études supérieures en vue de l'obtention du grade de Maîtrise en droit - option recherche(LL.M)"

現實主義的理論特色在於偏好以權力的角度理解國際政治（特別是國家的行為）並且認為在一個處處充滿衝突的無政府狀態體系中，國家是最主要的分析單元。惟類此觀點不僅是一般研究者對於現實主義的誤認，更是現實主義對自我認知的不完備。雖然現實主義將法律或規範置於權力的概念之下，認為國際法只是國家可有可無的一項工具，但事實上國際法律規範與權力卻經常彼此相互影響。 本論文之目的並非要否定現實主義，而是欲對之進行修正及反省。由國際秩序此項議題作為起點，作者處理了下列幾個問題：首先，在國家所組成的國際社中，現實主義維持秩序的策略及其效果為何？其次，若此方法不具成效或有所疏漏，吾人是否有其它的選項可供作為維持國間家往來關係穩定與和平的方法？藉由探索國家創建國際法律規範的原因以及國際法的法源等諸問題，吾人發現國際法律規範之創立往往並沒有一套如同國內法那般正式且專責的機制，但被國家承認為規範或被接受為法律者的方式（例如：國家間的共識），卻不可反駁地存在於國際社會，在這些形成法律規範的方式中，國家（或其他行為者）可以清楚的認知到規範內容中所要求的義務與責任。 因此，儘管現實主義認為國際法不具重要性，但吾人仍應探就國家為何有時願意遵守法律規範的原因。並且設法釐清在現實主義是項研究典範中不同流派的現實主義理論，對於客觀存在的國際法律規範之評價與認知。基於現實主義並非單一的理論而是為一研究典範，故本文在內容上分別從古典現實主義、結構現實主義（包括守勢與攻勢兩種現實主義）、新古典現實主義，以及較為一般人忽略的英國學派等現實主義理論的派別中去探討國際法律規範在國際政治中的地位及功能。文中指出，長期以來人們對於現實主義的理解受限於權力政治這樣的標籤，從而視現實主義與國際制度或國際法為水火而不相容！但事實上，採用現實主義理解國際關係，不意謂著就必須對國際法持以否定的態度。毋寧，在現實主義與國際法律規範之間，存在的不是一種絕對的互斥關係。非結構理論型的現實主義，如古典現實主義，對於國際法即是採取正面肯定其功能的態度。 當瞭解現實主義的秩序觀及其維持秩序策略（權力平衡）的疏漏所在之後，本文解釋了國際法律規範形成的原因以及不同流派現實主義理論對於它的評價和觀點。接著，作者就國際政治的變遷情形做了觀察和檢驗，國際政治自冷戰結束後有了鉅幅轉變，雖然體系的本質依舊如昔，即由主權國家所組成的無政府狀態體系；但是體系內部已有了不同以往的發展和變革。舉例來說，全球化現象已經從經濟領域擴展到政治和文化等其它層面，並向傳統的國家主權及其權力提出挑戰。其它諸如民族分離運動、環境生態等問題也對冷戰後的國際政治造成衝擊，這些影響主要體現在：行為體之間高度的互賴性、行為體之間差異性的擴大，以及對國際法律規範的迫切需要。上述事實使得傳統現實主義以國家作為主體的國際政治體系正朝向一個近似中世紀主義的新政治體系在形成。在此體系中，國家將喪失其原本在體系中的優勢主導性地位，而國際法律規範的發展也將相應的有所提升及調整。 事實上，並非所有行為者的行為皆忠實反映現實主義關於國際法無用論的主張。學者布爾即就國際法律規範所具有的三項政治性功能來解釋國際政治與法律規範間的關係：一、幫助國家認同與瞭解在他們彼此間所形成的「社會」事實；二、在國家和其他行為者間定訂一套基本的互動規則；三、裨益國際社會的成員達成進一步的共識與承諾。結論指出，國際法律規範是國際政治中一項不可獲缺的部分，為了克服傳統現實主義及以結構理論為核心的現實主義在解釋上的不足，「國際社會」的概念必須被深入瞭解和應用在現實主義的理論建構中。同時，吾人應投入心力展開對全球性議題的研究，例如：人權與環保，因為在這些領域中，一項現實主義最為核心的思考—國家主權的獨立與完整，將會遭遇到越來越多的挑戰並使國家藉口主權作為脫逸國際法律規範的可能性大為減低。 / The characteristic feature of Realism is its use of the power concept to explain the course of international politics (especially the behavior of state). The primary unit of analysis is the State which is regarded as operating in an anarchical system dominated by conflict. However, both notions above are misunderstood not only by general students, but the partial of Realism itself as well. Although Realism aligns norms or law with power in so far as international law is considered a tool at the disposal of the most powerful. Yet international legal norms and power also frequently do interact actually. This thesis doesn’t mean to deny the value of Realism, instead, tries to modify and introspect its viewpoints. Starting at the issue of international order, there are several tasks having been done: what is the strategy for Realism to keep order in the society of states and how does it work? Then, if the way for keeping order in Realism wasn’t constructive or in vain, do we have other choices to retain the relationship among the states stable and peaceful? By way of finding out why the states created international law and what the sources of international law are, we can think that the making process of international legal norms and norms itself don’t possess one formal mechanism responsible for law creation like the domestic law, but there are recognized and accepted methods by which legal norms or rules came into existence, for example, the consent of states. In those methods the precise content of legal norms can be identified by states (or other actors). Despite, therefore, the realist perspective deems international law to have no significance in its own right but we still have to seek to ascertain why do the States obey international law sometimes, if not always, but at least. And make it clear to know what the appraisal and perception in different schools under the Realism Paradigm. As we have known the Realism is not a single theory but a research paradigm, the author investigated respectively the different schools of Realism; they are Classical Realism, Structural Realism (including Offensive and Defensive Realism), Neoclassical Realism and Realism in English School. As the content points out, people whose stereotype of Realism has been limited to power politics are used to thinking that international institutions (and regimes) or international law is incompatible with the Realism, usually. However, it’s not absolute for us to consider that Realism turns down international law necessarily. For one instance, Realism without using structural concept, like Classical Realism, takes the positive attitude toward the role and the functions of international legal norms. After realizing the Realism’s conception of order and what the flaw of its strategy (Balance of Power) to maintain order is, this thesis then mentioned about the reasons why international law is created, and how different school under the Realism Paradigm evaluates international law. Following up, the author inspected the change in international politics. In the post Cold War era, though the nature of international system is still like what it used to be, a Anarchical system, the different and new phenomena do really happen. Globalization, for instance, is one momentous challenge to the sovereignty of States and their political power. The rest like separatist movements, environmental problems are also influential to international politics. The central issues of those influences are the interdependence among actors, the dissimilarities among actors and the yearning for international legal norms. Under the perceptions like this, the traditional state-centric international system of Realism has been being toward a Neo-Medieval system. In that system, state actors will lose their predominant and leading stand. On the other hand, the development of international legal norms will adjust itself to the new world and become more important. In fact, the behavior of international actors does not seem to bear out the realist assumption of the impotence of international law. Bull, for example, explains the international law-international politics relationship in terms of three political functions fulfilled by international law: to identify the idea of a society of sovereign States, to state the interactive basic rules of coexistence among States and international actors, and to help mobilize compliance with the rules of international society. As the conclusion in this thesis pointed out, international legal norms is one part of international politics. In order to overcome the inadequacies of the traditional and structural realist interpretation, the concept of ‘International Society’ must be dealt and applied explicitly and deeply in constructing theory of Realism. Meanwhile, people should spend more time researching the global issues, such as human rights and environmental protection, because in these sectors, the most core of realist thinking, independence and integrity of sovereignty, will get into plight and encounter more and more challenges, and the possibility for the States to get rid of international legal norms in the name of sovereignty becomes less and less.