Constituent power and necessity supply no lawful procedure within Ukraine's order, and international law would not cure an extra-constitutional cession

The Gist

The idea that 'the people can always start over' does not give Ukraine a legal procedure under its current Constitution, and the Constitutional Court has said there is no way to change the Constitution outside its own amendment chapter. International law does allow countries to change borders by agreement, so it does not ban cession outright. But it does not fix a domestic legal defect, and a treaty forced by unlawful war is void, though those international rules are narrow and debated. This packet steelmans the argument in its best light, for analysis; it is not an endorsement of its conclusions, and it is not legal advice.

Conclusion

A theory of constituent power or necessity may explain how a people could remake its constitutional order, but it supplies no lawful procedure within the existing one; any extra-constitutional cession would lack domestic legality, and international law would not cure that defect, since it gives Ukraine grounds to contest a treaty concluded in manifest breach of its fundamental competence rules and voids a treaty procured by unlawful force.

Premises

1. The Constitution provides for its amendment only through Chapter XIII and contains no procedure for a constituent assembly or for replacing the Constitution as a whole.
2. In Decision No. 4-r/2018 the Constitutional Court held that the Constitution provides no amendment route outside Chapter XIII and struck down a referendum law that would have allowed a new constitution or amendments to be adopted by referendum outside that procedure.
3. No official has constitutional or statutory authority to relinquish territory, and acts aimed at it may be prosecuted under Article 110 of the Criminal Code as encroachment on territorial integrity.
4. International law allows states to change frontiers by agreement, but it does not cure a lack of internal competence: under Article 46 of the Vienna Convention on the Law of Treaties a state may invoke a manifest violation of a fundamental internal rule on competence to conclude treaties, and under Article 52 a treaty procured by the unlawful threat or use of force is void.
5. The UN General Assembly has called on all states not to recognize Russia's purported annexations of Crimea in 2014 and of four regions in 2022.

Assumptions

• Uti possidetis juris fixes boundaries at the moment of independence; it does not by itself forbid a later boundary change agreed between states, and the Helsinki Final Act expressly allows frontiers to change by peaceful means and by agreement.
• Recognition of territorial change is governed by customary law and the duty not to recognize acquisitions by force, not by the Vienna Convention on the Law of Treaties; the Convention matters instead through Article 46 (manifest violation of a fundamental internal rule on competence) and Article 52 (treaties procured by unlawful force), whose thresholds are narrow and contested.
• Some commentators argue that constitutions yield to state survival in extremis; Ukraine's Constitution contains no necessity clause that authorizes territorial cession, so such a claim would be political, not a lawful procedure.

Analysis

Argument type: Deductive.

Potential Fallacies

• Scope/modal overreach (Conclusion (final clause) and P4) — The premises show that Ukraine 'may invoke' Articles 46 and 52 under narrow, contested thresholds. The conclusion that international law 'would not cure' the defect is stronger. If the 'manifest' threshold is not met, international law would treat the treaty as valid, which is in effect a cure from the counterparty's perspective. A reformulation such as 'international law does not automatically cure the defect and gives Ukraine a colorable ground to contest' would follow from the premises.
• Conditional treated as unconditional (Conclusion and P4 (Article 52 limb)) — Article 52 applies only if the treaty was procured by unlawful force, which is a factual question. The conclusion's antecedent is any 'extra-constitutional cession', but voidness under Article 52 requires an added factual premise of coercion, which is not established. Applying Article 52 to a war-ending settlement is itself contested.
• Relevance slippage (P5) — Non-recognition resolutions concern annexation by force, not a consensual (even if constitutionally defective) cession. P5 supports at most the coercion branch and says little about the competence branch. The resolutions are also non-binding, and the legal duty of non-recognition rests on customary law.
• Argument from silence / selective treatment of provisions (P1, P3 and title) — Absence of an enabling provision is treated as absence of power. That is generally sound in a system of enumerated competences, but here it needs affirmative support from Articles 2, 73 and 157. Article 73's referendum provision is not addressed, which leaves the universal negative exposed.
• Overextension of precedent (P2) — Decision 4-r/2018 concerned a referendum law and routes to constitutional amendment or a new constitution. It did not squarely decide whether an Article 73 territorial referendum is available. Extending it to foreclose every route to cession goes beyond its holding.
• Partial circularity (P3) — Article 110 criminalizes acts aimed at changing territory in violation of the Constitution, so citing it to show that cession is unconstitutional presupposes the point. It shows consistency with the argument, not independent support.
• Legal validity conflated with practical effect (Conclusion) — Having grounds to contest a treaty is not the same as being able to unwind it. Outcomes depend on third-state recognition, Ukraine's willingness and capacity to invoke the grounds, and later acquiescence. The argument gives a snapshot of legal rules and not the dynamics by which positions erode or consolidate.

Counterarguments

These challenges are not ranked.

• Conclusion and Premise 4 (High impact) — Article 46 is almost never successfully invoked (Cameroon v. Nigeria). Heads of state are presumed competent to bind their state (Art. 7), internal law is no excuse for non-performance (Art. 27), and a treaty signed and ratified by Ukraine's organs would bind it. Estoppel and acquiescence would also bar later challenge. International law therefore effectively 'cures' most competence defects.
• Premises 1 and 3, and the title (High impact) — Article 73 reserves territorial alteration to an all-Ukrainian referendum, and Chapter XIII (with Article 156) provides a route to amend Articles 2 and 133. The obstacles are procedural and temporary (martial law under Article 157, the absence of a referendum law), not a prohibition. 'No lawful procedure exists' therefore overstates the position.
• Premise 2 (Medium impact) — Decision 4-r/2018 addressed an ordinary referendum law and amendment routes. A constituent-power theorist would say it binds only the existing order and does not touch the people's underlying authority, so it begs the question. A reconstituted Court could also distinguish it.
• Assumption 3 and Conclusion (Medium impact) — Treating necessity as 'political, not lawful' settles the matter by definition. If a constitution cannot yield even in the face of existential defeat, it becomes a suicide pact, and legal orders in practice adapt or are remade in extremis (revolutionary legality, Kelsen's efficacy). The argument explains the law as written but may not predict what actually binds.
• Premise 5 (Medium impact) — Non-recognition attaches to acquisitions by force. A Ukrainian-signed, ratified settlement is a different category and could weaken the non-recognition rationale. The resolutions are non-binding and the supporting coalition may erode.
• Premise 4 (Article 52 limb) (Medium impact) — A war-ending settlement, or pressure from a patron rather than the aggressor, may not count as a treaty 'procured' by unlawful force. Many imposed peace settlements have been treated as valid, and a state invoking its own duress faces evidentiary and causation burdens.

Suggested Improvements

• Address Article 73 directly — Confront Article 73, Article 2, Article 156 and Article 157 together. State that a referendum route exists textually but is currently unavailable (martial law bars referendums and amendments, and there is no operative general referendum law), and argue why it could not regularize a cession, or concede it could. This is the most obvious counter-move for an informed reader. Addressing it would convert a vulnerable universal negative into a defensible claim about availability.
• Calibrate the international-law conclusion — Reframe the final clause: international law does not automatically validate a treaty concluded in breach of fundamental competence rules, and gives Ukraine colorable but narrow grounds to contest it, with Article 52 available only on proof of unlawful coercion. This aligns the claim with what P4 and A2 actually support and removes the gap between 'may invoke' and 'would not cure'.
• Engage the counterparty's position — Address Articles 7 and 27 VCLT, Cameroon v. Nigeria, and estoppel and acquiescence. Explain why Ukraine's constitutional limits are 'manifest' (they are public and well known) and how the risk of implied consent can be managed, for example through explicit ratification contingencies. Pre-empting the strongest international-law rebuttals strengthens the Article 46 limb.
• Separate coercion from competence branches — Treat Article 46 and Article 52 as independent conditional arguments and state the factual predicate for Article 52. Reposition P5 as support for the coercion branch only. This removes the scope shift and the relevance slippage.
• Strengthen sourcing and add pinpoint citations — Cite the specific paragraphs of Decision 4-r/2018, the text of Criminal Code Article 110, and resolution numbers and vote tallies, rather than relying on platform summaries. This improves auditability and makes the scope of the holdings clear.
• Distinguish legality, legitimacy and effectiveness — State expressly that the thesis concerns legal status, and acknowledge that a defective cession may still be effective, tacitly accepted or politically durable. Briefly address when constituent power or necessity would be morally or politically justified. This preempts the charge that the argument conflates legal defect with practical remedy and ignores the human costs and legitimacy questions that motivate necessity claims.

Scenario Tests

• A peace deal is signed by the President and ratified by the Rada without a referendum or constitutional amendment, ceding occupied territory. (Supports) — Domestic illegality is clear under Articles 2, 73 and 157 and Decision 4-r/2018. Whether Article 46 would let Ukraine contest the treaty is uncertain, since ratification by parliament and presidential authority cut against 'manifest' violation, though the publicity of the constitutional limits helps.
• After martial law ends, an all-Ukrainian referendum approves a territorial settlement under Article 73, followed by a Chapter XIII amendment. (Challenges) — A lawful-looking route arguably exists and the cession would not be 'extra-constitutional'. The title's 'no lawful procedure' claim is overstated, and the thesis survives only as a claim about the present unavailability of such a route.
• A cession is signed under ongoing Russian military pressure and Ukraine later repudiates it citing Article 52. (Neutral) — The Article 52 argument is available in principle but depends on proving unlawful force that procured the specific text. Practice on war-ending settlements is mixed, and outcomes will depend on third-state positions as much as legal doctrine.
• A post-war political rupture in which a new constituent assembly, claiming popular sovereignty, adopts a new constitution authorizing the cession. (Supports) — This fits the thesis: constituent power explains the remaking but supplies no lawful procedure within the old order. It also shows the limit of the argument, since the new order may be accepted as legally valid by its own terms and by others through effectiveness.
• Several states, shifting from 2014 and 2022 positions, extend de jure recognition to a Ukrainian-signed settlement. (Challenges) — Non-recognition is a political stance backed by a customary duty, but a consensual treaty falls outside the paradigm of acquisition by force. P5 offers little protection, and Ukraine's legal grounds would be of limited practical use.

Coherence & Relevance

The argument is coherent and carefully hedged in its stated assumptions. It separates legality from legitimacy, and domestic validity from international validity, and it concedes that agreed frontier change is permissible and that Articles 46 and 52 are narrow. Its first conjunct, that constituent power and necessity supply no lawful procedure within the existing order, is nearly analytic and well supported. The second, domestic illegality of extra-constitutional cession, is strong with a modest bridging principle. The third, that international law would not cure the defect, is weaker and is stated more firmly than the premises allow. The omission of Article 73 and the weak relevance of P5 reduce the overall force, but the core domestic-law claim is robust and the international limb is defensible if reformulated as 'colorable but contestable grounds'.

• The Constitution provides for its amendment only through Chapter XIII and contains no procedure for a constituent assembly or for replacing the Constitution as a whole. (Strong) — Directly supports the 'no lawful procedure within the existing order' limb. Does not address Article 73's referendum on territorial questions and says nothing about the international-law limb.
• In Decision No. 4-r/2018 the Constitutional Court held that the Constitution provides no amendment route outside Chapter XIII and struck down a referendum law that would have allowed a new constitution or amendments to be adopted by referendum outside that procedure. (Strong) — Bears directly on constituent-power arguments, but concerns amendment routes and a general referendum law, not territorial cession. It is evidence of domestic law only and does not bind a successor order.
• No official has constitutional or statutory authority to relinquish territory, and acts aimed at it may be prosecuted under Article 110 of the Criminal Code as encroachment on territorial integrity. (Moderate) — Reinforces domestic illegality but partly repeats P1 and P2 at the statutory level. The 'no authority' claim is a negative that needs affirmative textual support, and Article 110 presupposes the illegality at issue.
• International law allows states to change frontiers by agreement, but it does not cure a lack of internal competence: under Article 46 of the Vienna Convention on the Law of Treaties a state may invoke a manifest violation of a fundamental internal rule on competence to conclude treaties, and under Article 52 a treaty procured by the unlawful threat or use of force is void. (Strong) — Relevant to the international limb, but supports only 'grounds to contest', not 'would not cure'. The narrow Article 46 threshold, Articles 7 and 27, acquiescence, and the unestablished factual predicate for…
• The UN General Assembly has called on all states not to recognize Russia's purported annexations of Crimea in 2014 and of four regions in 2022. (Weak) — Concerns annexation by force, not consensual or defective-competence cession. It supports at most the coercion branch by analogy, and the resolutions are non-binding.

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