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HAYASHI Mika
Graduate School of International Cooperation Studies / Department of International Cooperation Policy Studies
Professor

Researcher basic information

■ Research Keyword
  • arms control and disarmament
  • law of armed conflict
  • international security
  • public international law
■ Research Areas
  • Humanities & social sciences / International law
■ Committee History
  • Oct. 2012 - 2014, 国際法学会, 国際交流委員
  • CISS (Section of International Studies Association, now IDSS), Executive Council member, around 2007

Research activity information

■ Award
  • Feb. 2014 村尾育英会, 村尾育英会学術奨励賞, 爆発性戦争残存物の除去に関する共同責任
    HAYASHI MIKA
    Publisher

■ Paper
  • Law of the Sea, Sovereignty, and the East China Sea
    Mika Hayashi
    Jun. 2026, Hensel Howard (ed.), Security Dynamics in the East China Sea and Northeast Asia: Contemporary Challenges and Opportunities
    In book

  • William Letrône, Mika Hayashi
    Dec. 2025, Journal of International Cooperation Studies, 33, 59 - 67, English
    Scientific journal

  • Mika Hayashi
    May 2024, Security Dynamics in the South China Sea, 116 - 126, English

  • Mika Hayashi, Akihiro Yamaguchi
    Lead, Apr. 2024, International Community Law Review, 26(1-2) (1-2), 69 - 98, English
    [Refereed][Invited]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • 「対ロ経済制裁（2022.2. ～ 2022. 夏）の特徴とその国際法上の位置づけ」
    林 美香
    2023, (書籍)浅田正彦・玉田大編『ウクライナ戦争をめぐる国際法と国際政治経済』, 東信堂, 89 - 112
    In book

  • Mika Hayashi
    Brill, 2022, Journal of the History of International Law / Revue d’histoire du droit international, 24, 533 - 560
    [Refereed]
    Scientific journal

  • Mika Hayashi
    Abstract The nuclear sharing arrangements of the North Atlantic Treaty Organization (NATO) are arrangements that pre-date the Nuclear Non-Proliferation Treaty (NPT). This article revisits the nuclear sharing arrangements in light of the NPT, then examines the issues in light of a new treaty, the Treaty on the Prohibition of Nuclear Weapons (TPNW). The question of the compatibility between these arrangements and the NPT was initially solved by an understanding that the stationing of the US nuclear weapons in host States did not involve transfer of ownership or transfer of control of these weapons to host States. Compared to the initial acceptance of this interpretation, the contemporary acceptance is less solid. The nuclear sharing arrangements are questioned or criticised in the NPT Review process, both by non-nuclear-weapon States and nuclear-weapon States. In contrast, with regard to the TPNW, there seems to be no controversy; the TPNW explicitly provides that the States Parties must not allow stationing of nuclear weapons. The nuclear sharing arrangements would be incompatible with this prohibition. The article also briefly deals with a separate question, whether a client State of extended nuclear deterrence that does not allow stationing of nuclear weapons in its territory would also contravene the prohibitions in the TPNW. Given the scope and the nature of provisions of the TPNW, the article concludes that it would, if such a client State joins the treaty without a change in its policy regarding extended deterrence.
    Oxford University Press ({OUP}), Sep. 2021, Journal of Conflict and Security Law, 26(3) (3), 471 - 491, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Mika Hayashi
    T.M.C. Asser Press, 2021, Nuclear Non-Proliferation in International Law - Volume VI, 13 - 35
    [Refereed]
    In book
    Link to Kobe Univ. Repository (Kernel)

  • Non-Proliferation Treaty and Nuclear Disarmament: Article VI of the NPT in Light of the ILC Draft Conclusions on Subsequent Agreements and Practice
    Mika Hayashi
    2020, International Community Law Review, 22(1) (1), 84 - 106, English
    [Refereed]
    Scientific journal

  • Disarmament in Article 6 of the Non-Proliferation Treaty: In the Shadow of Professor Akira Kotera's "Paradigm of International Law"
    Mika Hayashi
    有斐閣, Mar. 2019, 国際法のダイナミズム―小寺彰先生追悼論文集, 749 - 769, Japanese
    [Invited]
    In book

  • Mika Hayashi
    2019, Masahiko Asada (ed.), Economic Sanctions in International Law and Practice, 223 - 243, English
    In book

  • Mika Hayashi
    Brill Nijhoff, 2018, International Community Law Review, 20(2) (2), 252 - 277, English
    [Refereed][Invited]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Export Control in the Arms Trade Treaty: Can It Have an Impact on the Prevention of Serious Violations of IHL?
    Mika Hayashi
    2017, D. Tamada and P. Achilleas (eds.), Theory and Practice of Export Regulation: Balancing International Security and International Economic Relations, 127 - 137, English
    In book

  • The Whaling Judgment and the Challenges of Dynamic Treaty Regimes
    Mika Hayashi
    Brill, 2016, Malgosia Fitzmaurice and Dai Tamada (eds.), Whaling in the Antarctic: Significance and Implications of the ICJ Judgment, 221 - 237, English
    In book

  • HAYASHI MIKA
    While the prohibition of the use of chemical weapons in international law is uncontroversial, lawful and effective options for third States to deal with a violation of this rule are far from clear. With the use of chemical weapons in the current conflict in Syria as a case study, this article first outlines the options for third States outside jus ad bellum, highlighting a numb
    2014, Journal on the Use of Force and International Law, 1(1) (1), 80 - 121, English
    [Refereed]
    Scientific journal

  • Mika Hayashi
    In 2007, Russia suspended a number of its obligations under the CFE Treaty. After a series of negotiations to persuade Russia to revert to compliance, to no avail, the USA and certain other States Parties to the CFE Treaty equally suspended a number of their treaty obligations in 2011. The CFE Treaty itself has a provision neither on suspensions nor on reactions to suspensions
    Oxford University Press ({OUP}), Apr. 2013, Journal of Conflict and Security Law, 18(1) (1), 131 - 150, English
    [Refereed]
    Scientific journal

  • クラスター弾条約及び対人地雷禁止条約における除去・廃棄義務とその支援義務 －非常設・非公式・非政府間組織を利用した履行確保の効果ー
    HAYASHI, MIKA
    信山社, Apr. 2013, 坂元茂樹・薬師寺公夫編『普遍的国際社会への法の挑戦 』芹田健太郎先生古稀記念, 603 - 625, Japanese
    In book

  • Mika Hayashi
    2013, Andrew Byrnes, Mika Hayashi and Christopher Michaelsen (eds.), International Law in the New Age of Globalization, 93 - 118, English
    [Refereed]
    In book

  • Introduction
    Andrew Byrnes, Mika Hayashi, Christopher Michaelsen
    2013, International Law in the New Age of Globalization, 1 - 8, English
    [Refereed]
    In book

  • Mika Hayashi
    Sep. 2012, CHINESE JOURNAL OF INTERNATIONAL LAW, 11(3) (3), 505 - 522, English
    [Refereed]
    Scientific journal

  • Mika Hayashi
    Brill Academic Publishers, 2012, Journal of International Humanitarian Legal Studies, 3(2) (2), 322 - 343, English
    [Refereed]
    Scientific journal

  • Mika Hayashi
    Ashgate, Feb. 2008, The Legitimate Use of Military Force: The Just War Tradition and the Customary Law of Armed Conflict, 135 - 160, English
    [Refereed]
    In book

  • The Information Revolution and the Rules of Jurisdiction in Public International Law
    Mika Hayashi
    Ashgate, 2007, Myriam Dunn et al. (eds.), The Resurgence of the State: Trends and Processes in Cyberspace Governance, 59 - 83, English
    [Refereed]
    Scientific journal

  • Objective Territorial Principle or Effects Doctrine? -Jurisdiction and Cyberspace-
    Mika Hayashi
    Dec. 2006, In.Law, 2006-No.6, pp. 284-302, English
    Scientific journal

  • Ottawa Convention on Landmines in Two Perspectives: International Humanitarian Law and Disarmament
    Mika Hayashi
    Ashgate, 2006, Sai Felicia Krishna-Hensel (ed.), Global Cooperation: Challenges and Opportunities in the Twenty-First Century, 75 - 108, English
    In book

  • Mika Nishimura Hayashi
    Ashgate, 2005, Howard M. Hensel (ed.), The Law of Armed Conflict: Constraints on the Contemporary Use of Military Force, 105 - 129, English
    Scientific journal

  • Mika Nishimura Hayashi
    Routledge, Sep. 2004, Howard M. Hensel (ed.), Sovereignty and the Global Community: The Quest for Order in the International System, 55 - 82, English
    In book

  • The Chemical Weapons Convention as a Regime: Its Compliance Mechanism
    Mika Nishimura
    国際関係論研究会, Sep. 2001, 国際関係論研究, 17 1-33頁(17) (17), 1 - 33, Japanese
    [Refereed]
    Scientific journal

  • 軍縮・軍備管理条約のコントロール制度に対する二つの考え方
    Mika Hayashi
    2000, 東京大学大学院総合文化研究科(修士論文), Japanese
    Scientific journal

■ MISC
■ Books And Other Publications
  • International Law in the New Age of Globalization
    Andrew Byrnes, Mika Hayashi, Christopher Michaelsen
    Editor, "Introduction" (1-8), “Clearance of Remnants of War and Its Assistance as Collective Responsibility” (93-118), Martinus Nijhoff, Mar. 2013, English
    Scholarly book

■ Lectures, oral presentations, etc.
  • States’ attitude towards law-making regarding cyberspace – methodological questions
    Mika Hayashi
    Jagiellonian University and Kobe University Workshop, "Legal Methodology: International and Comparative Perspective", May 2019, English, Kobe, Japan, International conference
    Oral presentation

  • Non-Proliferation Treaty and Nuclear Disarmament: Article VI in light of Subsequent Agreement and Practice
    Mika Hayashi
    "Subsequent Agreement and Practice in Treaty Interpretation", Kobe Workshop on International Law 2018, Dec. 2018, English, Kobe, Japan, International conference
    Oral presentation

  • When a Sanction is Busted: Siemens’ Turbines in Crimea
    Mika Hayashi
    INGEER 2017 International Symposium on Theory and Practice of Export Control, Nov. 2017, English, Kobe, Japan, International conference
    Oral presentation

  • Third States' Role in Ensuring Compliance: A Case Study of the Use of Chemical Weapons in the Syrian Conflict
    HAYASHI MIKA
    IHL in Action -150 years of humanitarian challenges- The Responsibilities of States and the Role of the Red Cross, Feb. 2014, English, Embassy of Switzerland in Japan / Kyoto University / International Committee of the Red Cross, International Conference Hall at Clock Tower, Kyoto University, International conference
    Oral presentation

  • “Responsibility of Clearance and Assistance in the Ottawa Convention on Landmines – Who Does What, and Why: Does That Matter? –”
    Mika Hayashi
    International Law in the New Era of Globalization (The Third Four Societies Conference), Aug. 2010, English, Awaji, Japan, International conference
    Oral presentation

  • Implementing Humanitarian Norms through Multilateral Treaties
    Mika Hayashi
    日本国際政治学会２００７年度研究大会・分科会, Oct. 2007, Japanese, 福岡, Domestic conference
    Others

  • International Supervision in the NPT Regime
    Mika Hayashi
    Seventh International CISS Millennium Conference, Jun. 2007, English, CISS, Portugal, International conference
    Public symposium

  • The Martens Clause, Military Necessity and Supreme Emergency
    Mika Hayashi
    Sixth International CISS Millennium Conference, Jul. 2006, English, CISS, The Hague, International conference
    Oral presentation

  • (Panel member in the round table on the contemporary law of armed conflict)
    Mika Hayashi
    47th Annual ISA Convention, Mar. 2006, English, International Studies Association, San Diego, U.S.A., International conference
    Public symposium

  • Evolving Code for Public International Law
    Mika Hayashi
    Complexity, Science and Society Conference, Sep. 2005, English, Centre for Complexity Research, Liverpool, U.K., International conference
    Public symposium

  • Utility of International Law of Pre-Internet Era for Cyberspace
    Mika Hayashi
    International Conference on the Information Revolution and the Changing Face of International Relations and Security, May 2005, English, Eidgenossische Technische Hochschule /CISS, Luzern (Switzerland), International conference
    Oral presentation

  • The Clarification of Ambiguity in Treaties through National Implementation Measures: Case of the Ottawa Convention on Landmines
    Mika Hayashi
    Fifth International Conference, Jul. 2004, English, CISS/ISA, Saltzburg, Austria, International conference
    Others

  • The Vanishing Point of International Law?-The Law of War
    HAYASHI Mika
    CEEISA/ISA International Convention, Jun. 2003, English, CEEISA/ISA, Budapest, Hungary, International conference
    Oral presentation

  • Unprecedented Constraint on the Sovereignty in the Field of Disarmament?-A Legal Analysis of the CWC-
    NISHIMURA Mika
    Fourth International Conference, Jun. 2002, English, CEEISA/ISA, Brugge, Belgium, International conference
    Oral presentation

■ Affiliated Academic Society
  • Japanese Society of International Law

■ Research Themes
  • 国際法諸分野における「責任」の諸態様とそれらの相互関係
    小寺 彰, 伊藤 一頼, 塚原 弓, 玉田 大, 林 美香
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 東京大学, 01 Apr. 2010 - 31 Mar. 2014
    本プロジェクトは、現代国際法学において流布し国家責任条文草案でも前提とされている、あらゆる義務違反は責任を生じさせるという「一般法としての国家責任法」を観念し得るのかという問題に、歴史的・分野横断的観点から迫ってきた。本年度は、プロジェクトの集大成として、国家責任法の歴史、実定法としての国家責任法の評価に関わる報告及び総括を行う研究会を行った。 第一に、「第一次大戦以前の国際法・国際法学における『責任』―国際法における国家責任法成立」と題する報告が行われ、19世紀以前には、正戦論において戦争の正当原因の一つとして賠償義務の存在が想定されていたこと、また、正戦論を前提としなくとも、慣習法たる責任法が戦争回避の手段として否定されていたわけではないことが確認され、国際法の国家責任法が成立したのは19世紀後半以降であるという従来の理解に修正を迫ることが出来た。また、19世紀の学説、実行共に、その適用対象を外国人損害に限定していたわけではなく、そうした観念は、むしろ戦間期に成立した可能性が指摘された。 第二に、「国際法における緊急避難の考察」と題する報告が行われ、国家責任条文草案成立以前の実行における緊急避難法理には、権利として存在する「自衛型」と義務違反の存在を否定する「不可抗力型」のものが存在し、一般法を志向し二次規範として機能する条文草案上の緊急避難とは異なり、事案に応じて一次規範のレベルで機能していたことが指摘された。 本プロジェクトによって、「一般法としての国家責任法」という観念が歴史的に一貫して採用されてきたわけではないこと、また、「責任」の意味や効果も個別の分野によって変わりうることが浮き彫りにされたことが大きな成果と言える。このことは、一般法としての国家責任法を想定すること自体検証を要することを意味し、条文草案の評価及び国家責任法の解釈論に大きな影響を与えるものである。

  • 坂元 茂樹
    科学研究費補助金／基盤研究(A), 2011, Coinvestigator
    Competitive research funding

  • 坂元 茂樹
    科学研究費補助金／基盤研究(C), 2008, Coinvestigator
    Competitive research funding

  • The Law of Treaties Reexamined in the Contemporary Context :Reality of the State Consent to Treaty Obligations
    SAKAMOTO Shigeki, IGARASHI Masahiro, SHIBATA Akiho, HAMAMOTO Shotaro, SAKAI Hironobu
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 2004 - 2007
    This research tries to reexamine the law of treaties in the contemporary context. Recent developments, particularly those regarding reservations or interpretation, reveal the necessity to reconsider the very foundation of the law of treaties, i.e., voluntarism. Sakamoto examined the evolution of treaty obligations through his research on the International Covenant on Civil and Political Rights and the United Nations Convention on the Law of the Sea, with particular emphasis on the rules on treaty interpretation. Igarashi studied international legal issues related to the so-called post-war compensation and examined the evolution of interpretation of the Hague Convention and the Hague Regulation as well as the San Francisco Peace Treaty. Shibata, with his rich experience in practice in the fields, studied the influence exerted by treaty organs on the evolution of treaty interpretation as regards international environmental treaties, particularly the Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and their Disposal, and the Antarctic Treaty. Hamamoto studied the role of treaty organs and the evolution of treaty stipulations with regard to the International Covenant on Civil and Political Rights and the International Investment Agreements. Sakai took in charge of the law of international organizations, especially the law of the United Nations, and carried out case studies on recent peacekeeping operations. The results of the research are essentially descriptions of relevant phenomena and the research does not involve an extensive theoretical analysis or an examination of background of these phenomena. However, the research is considered to have produced appreciable results, taking into account the fact that these phenomena have not been sufficiently described in a comprehensive manner.

  • 輸出管理制度の新しいパラダイム―「経済安全保障」に向けた包括的分析―
    Coinvestigator

  • 安全保障貿易管理の法秩序―安全保障と国際経済の均衡点の分析と実務提言―
    Coinvestigator

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