> ## Content Index > Fetch the complete content index at: https://www.lacaribenanews.com/llms.txt > Use this file to discover other available public pages before exploring further. # A British Minister Told the Commons That Provisional Measures Are Binding. Argentina Had Just Asked Hamburg for Four. - URL: https://www.lacaribenanews.com/uk-provisional-measures-binding-commons-itlos-sea-lion-2026/ - Published: 2026-10-16T00:11:57.000Z - Updated: 2026-11-01T05:20:19.000Z - Description: Argentina asked the International Tribunal for the Law of the Sea on 13 October 2026 to order the United Kingdom to prevent exploitation of the Sea Lion field, one of four provisional measures sought under Article 290(5). That afternoon a British minister told the Commons such orders are binding. - Author: Theon Alleyne - Tags: Energy, Law, Argentina, Analysis **Quick summary:** Argentina asked the International Tribunal for the Law of the Sea on 13 October 2026 to order the United Kingdom to prevent exploitation of the Sea Lion field, one of four provisional measures sought under Article 290(5) of the Convention. That afternoon a British minister told the Commons such orders are binding on the parties. By LCN Business Desk The request reached Hamburg on a Tuesday. By mid-afternoon in London, a minister was on her feet in the House of Commons explaining what Argentina's case does not do. ## What did Argentina file at Hamburg? Four provisional measures, pending an arbitration that has no tribunal yet. The International Tribunal for the Law of the Sea published the request the same day. In [ITLOS/Press 401](https://www.itlos.org/fileadmin/itlos/documents/press%5Freleases%5Fenglish/PR%5F401%5FEn.pdf?ref=lacaribenanews.com) the Tribunal records that on 13 October 2026 Argentina submitted a request for the prescription of provisional measures against the United Kingdom under Article 290, paragraph 5, of the United Nations Convention on the Law of the Sea, in a "dispute concerning the exploitation of hydrocarbon resources in the South-West Atlantic Ocean". Arbitral proceedings under Annex VII to the Convention were instituted by a notification addressed to the United Kingdom on 28 September 2026\. Article 290(5) allows either party to ask the Tribunal for interim relief while that arbitral tribunal is still being constituted. | The four measures requested | | | --------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | (a) | that the United Kingdom prevent the commencement or continuation of the exploitation of hydrocarbon resources on the continental shelf in the North Malvinas Basin by the "so-called 'Sea Lion' project" | | (b) | that it refrain from using information obtained in the exploration of the disputed maritime areas "to the detriment of the rights of the Argentine Republic" | | (c) | that it cease preventing Argentina from complying with its obligation under Articles 192 and 194 to protect and preserve the marine environment of the areas in dispute | | (d) | that it refrain from any other measure that might aggravate the dispute, "in particular the granting of new permits" for exploitation of the disputed shelf | Source: ITLOS/Press 401, 13 October 2026\. The Tribunal states on the face of that release that its press releases do not constitute official documents. Two conditions govern whether the Tribunal grants any of it. It may prescribe measures if it considers that, prima facie, the arbitral tribunal to be constituted would have jurisdiction, and that the urgency of the situation so requires. Under Article 90(2) of the Rules of the Tribunal, the Tribunal or its President fixes the earliest possible date for a hearing, and that date is to be announced in a further release. Behind the request sits a Statement of Claim seeking four declarations of breach: of the obligation to respect Argentina's sovereignty and sovereign rights under Articles 2, 56 and 77; of the obligation to refrain from unilateral measures in disputed maritime areas "within the framework of the decolonization process governed by the United Nations"; of Part XII and Articles 192 and 194 on the marine environment; and of the obligation to settle disputes peacefully under Articles 279 and 300 and Article 2(3) of the United Nations Charter. ## What did the United Kingdom tell Parliament? That it will engage, and that the notification changes nothing on the water. Uma Kumaran, Parliamentary Under-Secretary of State for Foreign, Commonwealth and Development Affairs, made a statement on the Falkland Islands in the Commons on 13 October. She confirmed the 28 September notification, said Argentina had demanded that the United Kingdom prevent hydrocarbon activity in what she called the North Falkland basin, and said Argentina had threatened to seek provisional measures from the Tribunal. "I can confirm that the UK Government's intention is to engage with this process," she told the House, "that is consistent with our long-standing position in respect of international courts and tribunals." On Sunday 11 October, she said, the British embassy in Buenos Aires delivered the United Kingdom's formal response to the notification. Then the bound. Argentina's notification, she said, "does not constitute a judgment by an international court or tribunal. It does not invalidate licences issued by the Falkland Islands Government. It does not alter the islands' regulatory authority, and it does not require lawful activity on hydrocarbons development to cease." Source: Official Report, 13 October 2026, Commons Chamber, statement on the Falkland Islands. ## Where did the binding sentence come from? A backbench question about Article 298 and the Chagos Islands. The minister declined four times to give what she called a running commentary while proceedings are contemplated or under way. The sentence that did go further was drawn out of her by Dr Andrew Murrison, the Conservative member for South West Wiltshire, who asked whether it was "any surprise that President Milei cited the United Nations convention on the law of the sea annex VII in defence of his claim in relation to the sea lion field, when this Government are using article 298 to defend their position in relation to the Chagos islands". Article 298 of the Convention is headed "Optional exceptions to applicability of section 2". It lets a state declare that it does not accept compulsory procedures for certain categories of dispute. Her answer carried the concession and the rejection together. "The UK's established position is that provisional measures ordered under the applicable international legal framework are binding on the parties, and that the UK complies with its international obligations," she said. "On the matters raised in relation to Chagos, the situation is in no way comparable." She said the same of Chagos twice more in the same sitting, to Sir Julian Lewis and again on domestic drilling licences. Asked separately by the Liberal Democrat member for Surrey Heath, Dr Al Pinkerton, whether Britain would challenge any attempt to use the Convention to determine territorial sovereignty, she answered: "The answer to his question on UNCLOS is yes." On the record of previous cases, [MercoPress](https://en.mercopress.com/2026/10/13/london-says-it-will-abide-by-any-law-of-the-sea-provisional-measures-as-it-moves-to-shield-its-companies?ref=lacaribenanews.com) reports that tribunals under the Convention have declined to rule on territorial sovereignty disputes, citing Chagos in 2015 and Crimea in 2020. ## What is the trading interests power, and is it in force? A 1980 blocking statute, announced as an intention and not yet exercised. On the same afternoon the minister told the House that the Business Secretary "will, subject to the necessary parliamentary protocols, deploy the powers available to him under the protection of trading interests legislation against any Argentine measures that seek to influence or regulate lawful activity beyond Argentine jurisdiction." The instrument is the [Protection of Trading Interests Act 1980](https://www.legislation.gov.uk/ukpga/1980/11/section/1?ref=lacaribenanews.com). Section 1 gives the Secretary of State an order-making power where overseas measures regulating international trade apply to things done outside that country's territorial jurisdiction by persons carrying on business in the United Kingdom, and are "damaging or threaten to damage the trading interests of the United Kingdom". Having made such an order, the Secretary of State may then direct a person in the United Kingdom to refuse compliance. The parliamentary protocols the minister referred to are in the same section. Orders under section 1 are made by statutory instrument "subject to annulment in pursuance of a resolution of either House of Parliament". No order had been laid when she spoke. What has been issued is softer. Asked what more could be done to reassure international companies, she said conversations with businesses were ongoing and that "letters of comfort have been issued to businesses where we deem it necessary that they receive those letters." ## What has Argentina's own sanctions law done? Stalled in committee, and out of the special session. The measures the British order would block are not all in force either. The National Sovereignty Defence bill, sent to Argentina's Congress in September, failed to secure committee approval in the Chamber of Deputies and will not reach the special session planned for 21 October, MercoPress reported on 15 October. The fourth joint meeting of the Defence, Criminal Law and Foreign Affairs committees ended on Wednesday without agreement, with the opposition demanding that the text be split and the governing party refusing. The bill runs to 133 articles. The first 40 repeal the 2011 law penalising hydrocarbon exploration not authorised by Argentina and replace it with a regime of fines, disqualifications, a public register of offenders and prison sentences of up to 20 years. That first part has partial opposition support. The contested remainder creates a National Security Council chaired by the head of state and a protocol authorising, as a last resort, the shooting down of aircraft or sinking of vessels deemed hostile. So the position on 15 October is a request for interim relief at Hamburg with no hearing date, a British blocking order announced but not laid, and an Argentine sanctions regime that has not cleared committee. ## Why does this matter in the Caribbean? Because it is the same Convention, and a different forum from the one Guyana is in. Guyana produces oil in a country whose land boundary is disputed, and that dispute sits at the International Court of Justice rather than under the law of the sea Convention. No finding at Hamburg would bind anyone here. What the case tests is whether the Convention's interim machinery can halt production in waters two states both claim, and what a government concedes about the force of such orders while arguing that the tribunal should not reach the sovereignty question at all. The three preceding steps in the Sea Lion dispute were reported in [An Argentine Judge Has Ordered Sea Lion Halted](https://www.lacaribenanews.com/sea-lion-malvinas-court-injunction-rockhopper-navitas-2026/), in [An Argentine Judge Halted the Falklands Oilfield](https://www.lacaribenanews.com/falklands-offshore-licence-extension-sea-lion-guyana-2026/), and in [Argentina Charges the Sea Lion Operator](https://www.lacaribenanews.com/malvinas-oil-services-punta-arenas-sea-route-2026/), which covers the Punta Arenas to Stanley sea route Murrison also raised with the minister. The Guyanese reading of what support in a sovereignty dispute rests on was set out in [A Floor, Not a Relationship](https://www.lacaribenanews.com/opinion-essequibo-support-floor-not-relationship-2026/). ### What the title card shows Every data point on the article's title card, in text. - **4 provisional measures.** Those Argentina asks the Tribunal to prescribe against the United Kingdom, listed (a) to (d) in ITLOS/Press 401. - **Article 290(5).** The provision of the Convention under which the request was submitted, allowing interim relief pending constitution of the Annex VII arbitral tribunal. - **28 September 2026.** The date of the notification by which Argentina instituted the arbitral proceedings. - **11 October 2026.** The Sunday on which the British embassy in Buenos Aires delivered the United Kingdom's formal response to that notification. - **133 articles.** The length of Argentina's National Sovereignty Defence bill, which failed to clear committee in the Chamber of Deputies. ## Frequently Asked Questions What did Argentina ask the Tribunal to do? To prescribe four provisional measures against the United Kingdom: to prevent exploitation of hydrocarbon resources on the continental shelf in the North Malvinas Basin by the Sea Lion project, to refrain from using information from exploring the disputed areas to the detriment of Argentina's rights, to cease preventing Argentina from protecting the marine environment there, and to refrain from any measure aggravating the dispute, in particular granting new permits. What test will the Tribunal apply? It may prescribe measures if it considers that, prima facie, the arbitral tribunal being constituted under Annex VII would have jurisdiction, and that the urgency of the situation so requires. Has the United Kingdom said it will comply? Uma Kumaran told the Commons on 13 October that the United Kingdom's established position is that provisional measures ordered under the applicable international legal framework are binding on the parties, and that the United Kingdom complies with its international obligations. She also said the Government intends to engage with the process, and confirmed it would challenge any attempt to use the Convention to determine territorial sovereignty. What is the protection of trading interests power? Section 1 of the Protection of Trading Interests Act 1980 lets the Secretary of State make an order where foreign measures regulating international trade reach conduct outside that country's jurisdiction by persons carrying on business in the United Kingdom and damage British trading interests, and then direct British persons not to comply. Such orders are made by statutory instrument subject to annulment by either House. The minister announced an intention to use the power; no order had been laid when she spoke. Does any of this bind Guyana? No. The proceedings are between Argentina and the United Kingdom, and Guyana's own boundary dispute is before the International Court of Justice rather than under the law of the sea Convention.