Pacta sunt servanda is best described as?

• A. Treaties must be observed in good faith
• B. Treaties can be ignored
• C. Treaties are optional
• D. Treaties require domestic law changes

Answer: (A)

Pacta sunt servanda expresses a fundamental obligation in international law: once states consent to a treaty, they must observe it in good faith. This means the terms of the agreement are binding and must be carried out honestly and consistently, reflecting a trustworthy commitment to the other parties. The “in good faith” aspect emphasizes intent and sincerity; you don’t enter into a treaty with the aim of ignoring or bending its provisions.

Why this fits best is that it preserves predictability and reliability in international relations, enabling states to plan cooperation with the assurance that others will meet their obligations. While some treaties require domestic laws to give effect to their terms, the principle itself is about the binding nature of the treaty and the expectation of faithful implementation, not about whether domestic changes are needed to enforce it.