International Law Chapter Notes | Legal Studies for Class 12 - Humanities/Arts PDF Download

Introduction

Each country has its own body of law - domestic (municipal) law - which governs the conduct of its citizens and the functioning of its institutions. Domestic laws regulate private, social and commercial activities and the powers of the state.

When disputes involve two or more states, or private parties situated in different countries, questions arise about which legal system applies and which authority can adjudicate. To manage relations between states and to provide rules for such cross‑border interactions, a separate body of rules - international law - has developed.

Historical Development of International Law

The phrase “International Law” was popularised by the English jurist and philosopher Jeremy Bentham in the late 18th century (c. 1780). The Dutch scholar Hugo Grotius (1583–1645) is widely regarded as the father of modern international law. In his work On the Law of War and Peace (1625) Grotius emphasised principles such as the freedom of the high seas, a doctrine influential for maritime powers during the Age of Exploration and colonisation.

Although interstate agreements existed in earlier civilisations, the basic conceptual framework of modern international law took shape in Europe during the Renaissance and developed further through state practice, diplomatic negotiations, and judicial reasoning.

International Law versus Domestic Law

• Separate legal systems: International law is a distinct legal order regulating relations among states and certain international entities; municipal law governs the internal affairs of a state.
• Law‑making institutions: A legislature in a domestic system can enact binding statutes. By contrast, international fora such as the United Nations General Assembly may adopt resolutions, but most such resolutions are non‑binding recommendations; they become binding only when adopted as treaties or when other binding mechanisms exist.
• International courts: International courts (for example, the International Court of Justice (ICJ)) do not have automatic, compulsory jurisdiction over all states. The ICJ’s jurisdiction in contentious cases depends on the consent of the parties involved.
• Enforcement: There is no standing international police force or single global executive to enforce international law. The UN Security Council can authorise enforcement measures, including use of force, but permanent members may exercise vetoes, and any enforcement relies on member states contributing resources.
• Nature and sources: International rules arise from treaties, customary practice, general principles and subsidiary sources (judicial decisions and scholarly writings). Their operation depends heavily on state consent, reciprocity and the desire to preserve reputation and predictability in international relations.
• Scholarly debate: Jurists differ in characterising international law: for example, Oppenheim treated it as a genuine legal system; Austin criticised it as lacking law‑making and enforcement by a sovereign.

International Law and International Relations

• International law is integral to international relations: states normally act in conformity with established rules because non‑compliance can damage credibility and long‑term interests.
• Principles such as reciprocity and mutual self‑interest underpin compliance; states that breach agreements risk retaliation and loss of trust.
• The process of globalisation and the growth of international organisations since the late 20th century have increased both the volume and scope of international rules, and expanded law to govern international organisations themselves.
• Environmental and maritime law provide examples of multilateral rule‑making: the United Nations Convention on the Law of the Sea (UNCLOS) (1982) and multilateral environmental instruments reflect near‑universal consensus on shared problems.
• The Kyoto Protocol (adopted 1997, entered into force 2005) illustrates how states negotiated binding commitments to address global climate change by reducing greenhouse gas emissions; later agreements (e.g., the Paris Agreement) continued this trend of global cooperation.
• Although international law is formally premised on equality of states, power imbalances can influence the making and enforcement of international rules in practice.

Understanding International Law

In international law, the primary legal person is the state, though contemporary international law also recognises international organisations and, in several areas (human rights, international criminal law), individuals as subjects of rights and duties.

Traditional definitions (for example, Bentham’s) emphasise law as rules between states; modern doctrine recognises that international law binds or affects states, organisations and individuals depending on the area and the instrument creating the rules.

Most international law operates on the basis of state consent (especially treaty law). Nonetheless, there are limits: certain fundamental norms - known as jus cogens or peremptory norms - are so essential that no state may derogate from them by agreement. Examples include prohibition of slavery, genocide and torture (recognised as peremptory norms).

Types of International Law

• Public International Law: Governs relations between states and international organisations and covers subjects such as peace and security, diplomacy, the law of the sea, human rights, trade, environment and international criminal law.
• Private International Law (Conflict of Laws): Governs cross‑border civil and commercial disputes between private parties, addressing jurisdiction, choice of law and recognition and enforcement of foreign judgments.

Public International Law

Public international law regulates the rights and duties of states and intergovernmental entities in their dealings with each other and, in many cases, with individuals (notably in human rights and humanitarian law).

Its principal aim is to provide a predictable legal framework for international relations and to maintain international peace and security.

Major subject‑areas covered

• Peace and security
• Human rights
• International finance
• Airspace and outer space law
• International trade and the World Trade Organization (WTO)
• Intellectual property
• Development and international assistance
• Weapons and arms control
• Biodiversity and environment
• Science and security
• Fisheries and natural resources
• International crimes and criminal justice
• Climate change
• Extradition and mutual legal assistance

The World Trade Organisation (WTO)

• The WTO (established 1995; Geneva) is the primary multilateral organisation for regulating trade among nations. It operates on the basis of negotiated agreements signed and ratified by member governments.
• The WTO serves as a forum to negotiate trade liberalisation, a system of trade rules, and a dispute resolution mechanism for trade conflicts between members.
• The organisation helps producers, exporters and importers by providing stable and predictable rules for international commerce. (The WTO membership and trade coverage have expanded over time; historically, the WTO has included over 150 members representing the majority of world trade.)

Private International Law (Conflict of Laws)

Private international law (or conflict of laws) establishes rules to resolve disputes involving private persons, companies or families with connections to more than one jurisdiction. It seeks to determine:

• Which court has jurisdiction to hear a dispute, and
• Which jurisdiction’s substantive law should be applied to decide the issues?

Sources include international conventions, model laws, national statutes and judicial decisions. Important international bodies working to harmonise private international law include the Hague Conference on Private International Law, UNCITRAL, UNIDROIT and ICSID.

Examples of instruments that harmonise cross‑border commercial law include the United Nations Convention on Contracts for the International Sale of Goods (CISG) and the UNCITRAL Model Law on International Commercial Arbitration.

Sources of International Law

Article 38(1) of the Statute of the International Court of Justice (ICJ) sets out the primary sources that the Court applies in deciding disputes. These are widely accepted as authoritative sources of international law:

1. Treaties (conventions) - written agreements between states, either bilateral or multilateral, that expressly create legal rights and obligations.
2. International custom - general state practice accepted as law (opinio juris), i.e., actions taken in the belief that such practice is legally required.
3. General principles of law recognised by civilised nations - principles derived from national legal systems or common legal reasoning used to fill gaps where treaties and customs are silent.
4. Judicial decisions and teachings of highly qualified publicists - subsidiary means for determining rules of law and for interpreting other sources.

Although Article 38(1) does not formally rank these sources, courts and scholars typically consider treaties first, customs next, and then general principles; judicial decisions and scholarly writings are used as subsidiary aids.

Treaties

• Treaties are binding written instruments between states under international law; they can create rights and obligations and often provide dispute resolution mechanisms.
• The Vienna Convention on the Law of Treaties (1969) provides rules for the conclusion, interpretation and termination of treaties and is the principal guide to treaty law.

Customary International Law

• Custom requires consistent and general state practice combined with a belief that such practice is legally required (opinio juris).
• Establishing custom is fact‑sensitive; the North Sea Continental Shelf cases of the ICJ clarified that duration alone is not decisive - the nature, uniformity and acceptance of the practice matter.
• Some unsigned instruments, UN declarations and persistent state practice may indicate the emergence of customary rules.

Judicial Decisions and Scholarly Writings

• Decisions of international and national courts help clarify and develop international law. Under Article 59 of the ICJ Statute, ICJ decisions are binding only between the parties to that case and in respect of that particular dispute, but they carry persuasive authority.
• Writings of leading publicists and textbooks are used as subsidiary means to interpret and explain legal rules.

International Human Rights

The experience of atrocities during the Second World War led to an intensified international commitment to protect human rights. Human rights law now forms a substantial part of international law and combines treaty obligations with customary norms.

Important instruments and concepts

• Universal Declaration of Human Rights (UDHR) (adopted 1948) - a foundational, influential document articulating a broad range of civil, political, economic, social and cultural rights; it is not, by itself, a treaty but has informed binding instruments and customary law.
• International Covenant on Civil and Political Rights (ICCPR) - contains provisions on civil and political liberties; Article 4 of the ICCPR recognises that certain rights are non‑derogable even in times of public emergency (for example, the right to life and prohibitions on slavery and torture).
• Certain human rights norms (for example, prohibition of torture, genocide and slavery) are widely regarded as customary international law and/or jus cogens.
• Vienna Declaration and Programme of Action (1993) reaffirmed the universality, interdependence and indivisibility of human rights and led to creation of the office of the UN High Commissioner for Human Rights.
• Key treaties include the Convention on the Prevention and Punishment of the Crime of Genocide and the International Convention on the Elimination of All Forms of Racial Discrimination.

Human rights bodies

• The former Commission on Human Rights was replaced by the Human Rights Council, a UN body tasked with addressing human rights issues and promoting accountability.
• Regional human rights systems (for example, the European Court of Human Rights, the Inter‑American Commission and Court) provide additional fora for enforcement and interpretation.

Erga omnes obligations

• Erga omnes obligations are duties owed by states to the international community as a whole; severe human rights violations (such as genocide) are often classified as erga omnes obligations.
• Where obligations are erga omnes, any state may have a legal interest in ensuring compliance or seeking accountability for breaches, regardless of direct injury.

International Law and Municipal Law

The relationship between international law and domestic law varies by legal system and raises important questions when the two conflict.

Principles concerning conflicts

• Breach is not excused by domestic law: A state cannot justify violating an international obligation by reference to its municipal law.
• Treaty consent: A subsequent change in municipal law does not invalidate a state’s earlier consent to be bound by a treaty.
• Domestic legislation and implementation: Some treaties require domestic implementing legislation to give effect to treaty obligations within a state’s legal order.
• Prevalence in practice: Which law prevails depends on the forum: international tribunals will apply international law, while domestic courts generally apply domestic law, although domestic courts may interpret domestic law in light of international obligations.

Approaches in selected jurisdictions

• United Kingdom - doctrine of transformation: International agreements do not become domestic law unless implemented by domestic legislation; treaties must be transformed into municipal law to have direct domestic effect.
• United States: Customary international law is treated as part of federal law and can be applied by federal courts, but domestic statutes are not automatically invalidated because of customary international law. The US Supreme Court gives weight to international treaty interpretation but gives priority to conflicting domestic statutes.

International Law and Its Relation to India

India’s Constitution recognises the importance of international law and international obligations in its governance and foreign relations.

Constitutional provisions

• Article 51 (Directive Principles) urges the State to promote respect for international law and treaty obligations in the dealings of organised peoples with one another.
• Article 253 empowers Parliament to make laws for implementing international treaties, agreements and conventions, even if such legislation would encroach on subjects otherwise within state legislative competence.

Application of treaties and international law in India

• India traditionally follows the view that executive assent and ratification may be sufficient to make some treaty obligations operative, but where a treaty affects individual rights or requires regulation of subjects within legislative competence, implementing legislation by Parliament may be necessary.
• The Supreme Court of India has referred to international law in constitutional interpretation. In Kesavananda Bharati v. State of Kerala, the Court emphasised interpreting the Constitution consistently with the UN Charter and international norms where appropriate.
• In Maganbhai Patel v. Union of India the Court held that treaties that restrict citizen rights or alter domestic legal relations generally require implementing legislation to be enforceable.
• Conversely, in cases such as Sheela Barse v. Secretary, Children’s Aid Society, the Supreme Court applied international norms that supplemented domestic law without contradiction.
• In Vishaka v. State of Rajasthan, the Court used international conventions (for example, CEDAW) to develop domestic standards against sexual harassment at the workplace where domestic legislation was absent or inadequate.

Dispute Resolution in International Law

Dispute settlement is a central function of international law. States and other entities may resolve disputes through negotiation, mediation, conciliation, arbitration or adjudication before international courts.

The International Court of Justice (ICJ)

• The ICJ is the principal judicial organ of the United Nations. It settles legal disputes submitted by states and gives advisory opinions to UN organs and specialised agencies.
• The Court was established in its present form in 1946 under the Statute of the ICJ adopted by the UN. The Court sits at The Hague.
• ICJ judgments are final and binding on the parties to a case; there is no appeal. Enforcement depends on the willingness of states and, where necessary, measures by the UN Security Council.
• The ICJ’s jurisdiction in contentious cases is based on state consent; states may accept jurisdiction by treaty clause, special agreement, or a declaration accepting compulsory jurisdiction.
• The Court also provides advisory opinions under Articles 65–68 of its Statute; these opinions are not binding but carry substantial legal and moral weight.

International Criminal Court (ICC)

• The International Criminal Court, established by the Rome Statute (adopted 1998; entered into force 2002), prosecutes individuals for the most serious international crimes where national courts are unwilling or unable to act.
• The core crimes under ICC jurisdiction include: crimes against humanity, war crimes, crime of aggression, and genocide.
• The ICC’s jurisdiction is complementary to national jurisdictions; cases may be referred by states, by the UN Security Council, or initiated by the ICC Prosecutor under certain conditions.

Other mechanisms and forums

• Many treaties provide their own dispute settlement procedures (for example, trade agreements may establish dispute panels and appellate mechanisms).
• Arbitration (including investor–state arbitration under instruments like ICSID) and ad hoc tribunals are widely used to resolve interstate, commercial and investment disputes.
• International organisations (for example, the UN and the World Bank) have mechanisms and partnerships to address specific types of disputes, such as investment disputes or technical disagreements under specialised regimes.