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Discuss the right of the State parties to formulate reservations to а treaty under the Vienna Convention on the Law of Treaties, 1969. What are the legal effects of such reservations? Explain.

This question was previously asked in
UPSC CSE 2025 (Prelims) CSAT Official Paper (25-May-2025)

The Vienna Convention on the Law of Treaties (VCLT), 1969, generally recognizes the right of states to formulate reservations to a treaty (Article 19). A reservation is a unilateral statement made by a state when signing, ratifying, accepting, approving, or acceding to a treaty, by which it seeks to exclude or modify the legal effect of certain provisions in their application to that state. This flexibility encourages broader participation in multilateral treaties.

However, this right is not absolute. Reservations are impermissible if:

  1. The treaty explicitly prohibits them.
  2. The treaty allows only specific reservations, excluding the one proposed.
  3. The reservation is incompatible with the object and purpose of the treaty, a key criterion to prevent undermining its core essence.

Legal Effects of Reservations (Articles 20–21 VCLT):

  1. Acceptance: If a state accepts the reservation, the treaty provisions in question are modified or excluded in relations between the reserving and accepting states. The treaty remains in force between them.
  2. Objection (entry not precluded): If a state objects but does not oppose the treaty’s entry into force, the provisions to which the reservation relates do not apply between the two states. The remainder of the treaty remains effective.
  3. Objection (entry precluded): If a state objects and declares that the treaty cannot enter into force between itself and the reserving state, no treaty relationship is established. This occurs rarely and only for fundamentally incompatible reservations.

In essence, reservations allow states to tailor obligations and promote inclusivity, but their legal effects are reciprocal, creating a network of modified bilateral relationships within a multilateral treaty framework, balancing flexibility with respect for the treaty’s object and purpose.

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