sources of international law

International law sources influence legal governance across nations, fostering harmonization, fairness, predictability, and barrier-free trade.
The main sources of international law include:
- Treaties
- Customs
- Judicial decisions

Definition: Agreements between two or more nations for mutual cooperation.
Areas of impact: Defense, trade, extradition, and other international relations.
Historical context:
- Used since ancient times (pre-Roman Empire).
- Most modern treaties established post-World War II.
- Vienna Convention on the Law of Treaties (1980) is a crucial framework for interpreting treaty law.

Customary law operates under the principle
- Individual conduct is permissible unless explicitly prohibited.
States must prove both prohibitions and affirmative practices that they rely on in international law contexts.

Recognition by treaties and national laws of:
- International tribunals (e.g., International Court of Justice).
- National court rulings integrating international law principles.
Important concept: Comity
- Definition: The practice of nations to respect and honor the laws and decisions of each other's courts.
- Comity is a courtesy rather than a legal obligation, not mandating acceptance of foreign judgments.
- Example Case: Yahoo! v. La Ligue Contre Le Racisme, illustrating the notion of comity and international judicial respect.

Primary sources of international law encapsulate:
- Treaties: Agreements for cooperation among nations.
- Customs: Established practices permitting actions unless barred.
- Judicial Decisions: Acknowledgment of both international tribunals and national court applications of international law principles.