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From Factual and Conceptualist to Normative and Functional: The Law of Occupation After the ICJ Advisory Opinion on the Israeli Occupation of the Occupied Palestinian Territory

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Gross, A. From Factual and Conceptualist to Normative and Functional: The Law of Occupation After the ICJ Advisory Opinion on the Israeli Occupation of the Occupied Palestinian Territory. German Yearbook of International Law, 99999(), 1-24. https://doi.org/10.3790/gyil.2025.409908
Gross, Aeyal "From Factual and Conceptualist to Normative and Functional: The Law of Occupation After the ICJ Advisory Opinion on the Israeli Occupation of the Occupied Palestinian Territory" German Yearbook of International Law 99999., 2025, 1-24. https://doi.org/10.3790/gyil.2025.409908
Gross, Aeyal (2025): From Factual and Conceptualist to Normative and Functional: The Law of Occupation After the ICJ Advisory Opinion on the Israeli Occupation of the Occupied Palestinian Territory, in: German Yearbook of International Law, vol. 99999, iss. , 1-24, [online] https://doi.org/10.3790/gyil.2025.409908

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From Factual and Conceptualist to Normative and Functional: The Law of Occupation After the ICJ Advisory Opinion on the Israeli Occupation of the Occupied Palestinian Territory

Gross, Aeyal

German Yearbook of International Law, Online First : pp. 1–24

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Prof. Dr. Aeyal Gross, Tel Aviv Univesrsity, Faculty of Law / SOAS, University of London Tel Aviv University, Faculty of Law 69978 Tel Aviv, Israel

Abstract

Abstract: The International Court of Justice’s (ICJ) Advisory Opinion on the Israeli Occupation of the Occupied Palestinian Territory (OPT) issued in July 2024 is a turning point for the law of occupation. This article focuses on two major developments in this decision: first, the ICJ’s holding regarding the legality of Israel’s presence in the territory, which I argue in fact finds the Israeli occupation to be illegal; and second, the ICJ’s holding regarding the status of Gaza, through which I claim the ICJ adopted a functional approach to the question of the existence of occupation. The article points to how the ICJ’s approach to occupation in the Advisory Opinion shifts the law of occupation, as a matter of lege lata, in a normative and functional direction. The Advisory Opinion took an important step in these directions. However, I argue that while the ICJ bases its holding on the legality of Israel’s presence in the OPT on norms supposedly external to the law of occupation, anchored in jus ad bellum (i. e., prohibition on the use of force) and general international law (i. e., self-determination), in fact the determination about the legality of occupation transcends the jus ad bellum/jus in bello divide. Indeed, a better interpretation is one that points to how illegality stems from violations of the principles of the law of occupation itself (as part of jus in bello), which are shaped by general international law (including jus ad bellum). I further argue that the ICJ’s reasoning points to its de facto adoption of a functional approach to the existence of occupation and that a normative and functional approach are mutually complementary.

Table of Contents

Section Title Page Action Price
Aeyal Gross\nFrom Factual and Conceptualist to Normative and Functional: The Law of Occupation After the ICJ Advisory Opinion on the Israeli Occupation of the Occupied Palestinian Territory 1
Introduction 1
I. From Factual to Normative 3
A. The Principles of the Law of Occupation 3
B. The ICJ’s Opinion 4
C. Jus ad Bellum or Jus in Bello? 6
D. Occupation v. Conquest 11
II. From Conceptualist to Functional 14
A. The ICJ Advisory Opinion and the Status of Gaza 14
B. The Functional Approach as an Alternative to Conceptualism 16
C. Powers and Responsibilities of Occupiers 17
D. The Functional Approach as Normative 20
E. Lex Ferenda or Lex Lata? 22
Conclusion 23