Understanding the Law of Treaties in International Humanitarian Law

When countries commit to protecting civilians during armed conflict or agree to ban certain weapons, how do these international promises actually become enforceable law? The answer lies in a complex but essential legal framework known as the law of treaties. Understanding this framework is crucial for anyone studying International Humanitarian Law, especially in the South Asian context where countries navigate unique challenges in implementing international obligations.

What is a treaty in international law? 🔗

Before exploring how treaties work, we need to understand what they are. The Vienna Convention on the Law of Treaties defines a treaty as a written international agreement between states that is governed by international law. This definition encompasses everything from the Geneva Conventions protecting war victims to specific agreements banning cluster munitions.

Treaties can take many forms and carry different names such as conventions, protocols, agreements, or covenants. Regardless of their title, what matters is that they create legally binding obligations between states. The Vienna Convention on the Law of Treaties, adopted in 1969 and entering into force in 1980, serves as the definitive legal authority on how treaties are formed, interpreted, and enforced.

How states become bound by treaties 🔗

A state doesn’t automatically become bound by a treaty simply because it exists. There must be a clear expression of consent. The Vienna Convention outlines several methods through which states can express their consent to be bound by a treaty: signature, ratification, acceptance, approval, and accession.

Understanding signature 🔗

Signing a treaty is often the first step, but it doesn’t always create binding obligations. A state may sign a treaty in two ways. First, it can sign with the intention that the signature itself constitutes consent to be bound. This is relatively rare and usually occurs with simpler agreements. Second, and more commonly, a state signs subject to ratification, acceptance, or approval. In this case, the signature indicates the state’s preliminary agreement but reserves the final commitment for a later step.

Even when a signature doesn’t bind a state, it creates an important obligation. The state must refrain from acts that would defeat the object and purpose of the treaty until it clearly indicates it does not intend to become a party.

Ratification, acceptance, and approval 🔗

These three terms refer to the formal act whereby a state establishes its consent to be bound by a treaty on the international plane. While they are distinct terms, acceptance and approval have the same legal effect as ratification.

Ratification typically follows signature and requires the state to complete its domestic legal procedures. This might involve parliamentary approval, constitutional review, or other internal processes depending on the state’s legal system. Once these domestic requirements are met, the state deposits an instrument of ratification with the treaty depositary, which is usually the United Nations Secretary-General for multilateral treaties.

The terms acceptance and approval emerged as alternatives to ratification in certain states’ practices. Some countries use these terms when their domestic constitutional procedures don’t require formal ratification, or when they want to expedite the process. The key point is that all three methods carry identical legal weight.

Accession as an alternative path 🔗

What happens when a state wasn’t involved in negotiating a treaty but wants to join later? This is where accession becomes important. Accession allows a state to become party to a treaty after it has been negotiated and signed by others, essentially combining signature and ratification into a single step.

Accession is particularly relevant for newer states, or for states that initially chose not to participate but later decide the treaty aligns with their interests. The conditions for accession depend on the treaty’s provisions, which may allow all states to accede, limit accession to specific states, or require agreement from existing parties.

The depositary’s role in treaty administration 🔗

Treaties require administrative oversight, which is where the depositary comes in. The depositary keeps custody of the original treaty text, receives instruments of ratification and accession, and notifies all parties of relevant actions. For most multilateral treaties, the United Nations Secretary-General serves as depositary, ensuring transparency and proper record-keeping throughout the treaty’s lifecycle.

From international commitment to domestic law 🔗

Here’s where theory meets practice. A state may ratify an IHL treaty, but that ratification alone doesn’t automatically make the treaty enforceable within the country’s borders. The crucial next step is domestic implementation.

India’s dualist approach 🔗

India follows what’s called a dualist system. Under this approach, international law principles cannot be invoked in domestic courts without being expressly incorporated through national legislation. This means that even though India ratified the Geneva Conventions in 1950, specific legislation was needed to give them force in Indian law.

Article 253 of the Indian Constitution provides the constitutional mechanism for this incorporation. It empowers Parliament to enact laws implementing international treaties, agreements, or conventions. This provision serves as the bridge connecting India’s international obligations with its domestic legal framework.

The Geneva Conventions Act of 1960 🔗

India’s implementation of the Geneva Conventions provides an excellent example. After ratifying the four Geneva Conventions in 1950, India enacted the Geneva Conventions Act in 1960. This legislation didn’t just acknowledge the Conventions; it created specific criminal offenses for grave breaches, established universal jurisdiction, and ensured that IHL principles could be enforced by Indian courts.

This legislative action was essential because most IHL instruments require states to take domestic action to ensure compliance, including legislative, regulatory, and practical measures. Without the 1960 Act, India’s ratification would have remained largely symbolic.

Why domestic implementation matters 🔗

The gap between international commitment and domestic enforcement can be significant. States must integrate IHL into military training and manuals, mark protected objects like cultural heritage sites, and ensure combatants and protected persons receive identification cards. These practical steps require more than just treaty ratification.

Consider the challenge of prosecuting war crimes. Even if a state has ratified the Geneva Conventions, its courts cannot prosecute grave breaches unless domestic law defines these crimes, establishes jurisdiction, and provides procedural mechanisms for trials. This is why legislation like India’s Geneva Conventions Act is so critical.

Reservations and their impact 🔗

States don’t always accept treaties in their entirety. A reservation is a unilateral statement made when signing, ratifying, or acceding to a treaty, whereby a state excludes or modifies the legal effect of certain provisions in their application to that state.

However, reservations have limits. They cannot be incompatible with the object and purpose of the treaty. In IHL, many treaties either prohibit reservations entirely or allow only specified ones, recognizing that humanitarian protection should be universal and not subject to selective application.

The principle of pacta sunt servanda 🔗

At the heart of treaty law lies a fundamental principle: pacta sunt servanda, which means agreements must be kept. Every treaty in force is binding upon the parties and must be performed in good faith. Moreover, a state cannot invoke its internal law as justification for failing to perform a treaty.

This principle creates an important tension in dualist systems like India’s. While domestic implementation is necessary for enforcement within the country, the international obligation exists regardless of whether implementing legislation has been passed. A state cannot simply refuse to comply with treaty obligations because it hasn’t yet enacted the necessary domestic laws.

Moving forward with implementation 🔗

Understanding the law of treaties reveals why international humanitarian law implementation is both a legal and practical challenge. States must navigate complex domestic constitutional procedures while honoring international commitments. For India and other South Asian countries, this means not only ratifying IHL treaties but also ensuring robust domestic legislation, training programs, and institutional mechanisms exist to make these protections real.

The framework established by the Vienna Convention provides clarity on how states express consent and what obligations flow from that consent. But the ultimate test of any IHL treaty lies not in how many states have ratified it, but in whether its protections actually reach the people who need them during armed conflict.

What do you think? Should the international community develop more standardized implementation requirements for IHL treaties to close the gap between ratification and effective enforcement? How can countries like India strengthen the connection between their international treaty obligations and domestic legal systems?

References

1. https://legal.un.org/ilc/texts/instruments/english/conventions/1_1_1969.pdf
2. https://www.imo.org/en/about/conventions/pages/default.aspx
3. https://treaties.un.org/Pages/Overview.aspx?path=overview/glossary/page1_en.xml
4. https://www.wipo.int/en/web/wipolex/glossary
5. https://www.lawteacher.net/free-law-essays/international-law/domestic-implementation-of-international-law-law-essay.php
6. https://www.icrc.org/en/law-and-policy/domestic-law-and-ihl