An Open Legal Rejoinder on the Chagos Question

A Statement of Procedural Defects in the UN Decolonization Process and the Erasure of the Maldives

Editorial note: This Open Legal Rejoinder responds to an expert commentary by Professor Marc Weller, Programme Director of the International Law Programme, published by Chatham House on 26 January 2026.

Author
Pen for Rights – Maldivians for Chagos
An Indian Ocean decolonisation initiative

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Purpose of this rejoinder

This Open Legal Rejoinder responds to the expert commentary published on 26 January 2026 asserting that United Kingdom ratification of the 2025 UK–Mauritius Chagos treaty does not violate international law.

That commentary proceeds on a downstream treaty analysis that abstracts the Chagos question from the United Nations decolonization framework. This rejoinder identifies a sequence of upstream procedural and jurisdictional defects that condition, constrain, and ultimately undermine the conclusions reached.

First defect: Non-listing under Article 73(e) of the UN Charter

The foundational defect in the Chagos process is the failure to list the Maldives and its dependent maritime territories as a Non-Self-Governing Territory under Article 73(e) of the UN Charter.

Article 73(e) imposes a mandatory reporting obligation on administering powers. Non-compliance deprived the General Assembly of jurisdictional oversight at the decisive moment of territorial excision and prevented lawful assessment of:

• the territorial integrity of the Maldives as a colonial entity,

• reef-linked and functionally integrated maritime zones,

• the rights of Maldivian populations historically connected to those zones.

Decolonization cannot lawfully proceed where a colonial territory is excluded from the Charter mechanism designed to supervise its completion. This omission constitutes the original procedural defect from which all subsequent defects flow.

Second defect: Resolution 2066 (XX) inheriting the non-listing failure

UN General Assembly Resolution 2066 (XX) addressed the independence of Mauritius without curing the prior non-listing of the Maldives.

As a result, the resolution could not lawfully:

• test third-people rights,

• validate territorial excision affecting another colonial population,

• or regularize a process already defective at the jurisdictional level.

Resolution 2066 thus transmitted an incomplete and jurisdictionally defective decolonization record forward into subsequent UN processes.

Third defect: Inconsistent reliance on the Lancaster House arrangements by Mauritius

Mauritius has adopted materially inconsistent legal positions regarding the Lancaster House arrangements.

Before the Permanent Court of Arbitration in the Chagos Marine Protected Area arbitration, Mauritius relied on the Lancaster House undertakings to assert continuing fishing and mineral rights in the Chagos maritime zone.

Before the International Court of Justice, the same arrangements were characterized as coerced and legally void for purposes of sovereignty.

A state cannot simultaneously invoke an agreement as rights-conferring in one forum and void in another without engaging in abuse of process. This inconsistency is legally significant and undermines the integrity of the claim.

Fourth defect: Chagos not part of Mauritius at independence

Chagos was not included in the territorial definition of Mauritius at the moment of independence in 1968.

Mauritius did not inherit Chagos as part of its decolonization settlement. Rather, it later asserted a claim that became strategically advantageous only with the emergence of the modern law of the sea regime in the late twentieth century.

A post-independence desire for territory cannot retroactively transform that territory into part of the colonial unit at independence.

Fifth defect: Mischaracterization of the Chagossian population

The Chagossian population is frequently aligned with Mauritius in contemporary legal discourse. This alignment is historically and administratively inaccurate.

The Chagossians were:

• never a political constituency of Mauritius,

• never represented in Mauritian electoral processes,

• never listed on Mauritian voter registries,

• never incorporated into Mauritian civic or administrative structures at independence.

Historically, the population was predominantly Maldivian in origin, later supplemented by African slave and indentured labour introduced by colonial administrators.

Sixth defect: Multi-destination exile and absence of nationality determination

The manner of exile confirms the absence of any settled Mauritian nationality determination.

The Chagossians were deported not only to Mauritius but also to the Seychelles. Had there been any operative agreement or recognition that the population constituted Mauritian nationals, displacement would have occurred exclusively to Mauritius.

The multi-destination exile demonstrates that:

• no consolidated Mauritian nationality claim existed,

• no civic incorporation had occurred,

• the population was treated as colonial labour rather than a constituent people.

Seventh defect: Resolution 2066–derived constraints on the ICJ advisory opinion

The 2019 advisory opinion of the International Court of Justice was rendered within the limits of a question framed by a procedurally defective General Assembly record originating in Resolution 2066 (XX).

Because Resolution 2066 addressed the decolonization of Mauritius without curing the prior non-listing of the Maldives under Article 73(e) of the UN Charter, the General Assembly record placed before the Court was already jurisdictionally incomplete. As a result:

• the Maldives was never identified as an affected colonial entity,
• Maldivian third-state and third-people rights were never before the Court,
• and those rights were therefore not justiciable within the advisory proceedings.

The Court could not adjudicate matters that the General Assembly itself had procedurally excluded through Resolution 2066. An advisory opinion, however authoritative, cannot cure jurisdictional omissions inherited from a defective decolonization record.

Eighth defect: Resolution 73/295 as consequential, not curative

UN General Assembly Resolution 73/295 endorsed the advisory opinion but did not independently repair the foundational defects that shaped the question put to the Court.

Accordingly, Resolution 73/295 inherited the same procedural limitations arising from Resolution 2066 and the underlying Article 73(e) non-listing.

Ninth defect: Delimitation before decolonization

The inherited defects transmitted through Resolution 2066, the advisory opinion, and Resolution 73/295 enabled maritime delimitation proceedings to occur before lawful completion of decolonization.

Sovereignty determination must precede delimitation, not follow it. This inversion of legal order was possible only because the Maldives’ standing had been procedurally erased at the outset.

Tenth defect: Limits of bilateral treaties under Article 34 of the VCLT

Under Article 34 of the Vienna Convention on the Law of Treaties, a treaty creates neither obligations nor rights for a third State without its consent.

Neither the 1966 US–UK agreement nor the 2025 UK–Mauritius treaty can extinguish the rights of the Maldives or of a population historically unrepresented in Mauritian governance.

Conclusion

The legal issue is not whether the United Kingdom may rearrange its bilateral relationships, but whether the UN decolonization system lawfully engaged all affected colonial peoples.

It did not.