The 1995 Hydrocarbons Declaration and the Limits of Separating Sovereignty from Resources

The 1995 mechanism

On 27 September 1995, Argentina and the United Kingdom signed the Joint Declaration on Cooperation over Offshore Activities in the South West Atlantic. Like every substantive bilateral agreement since 1989, it opens with a safeguard clause: nothing in it changes or recognizes either side's claim to "sovereignty or territorial and maritime jurisdiction over the Falkland Islands," (Joint Declaration of 27 September 1995, para. 1) and no activity carried out under it may later be cited as evidence either government shifted position.

Within that frame, the two governments "agreed to cooperate in order to encourage offshore activities" — meaning hydrocarbon exploration and exploitation — in a defined Special Cooperation Area, divided into up to six tranches of 3,500 square kilometres each. A Joint Commission, with delegations from both sides meeting at least twice yearly, would supervise activity, propose environmental and safety standards, and encourage "commercial activities in each tranche... by means such as joint ventures and consortia from the two sides." (Joint Declaration of 27 September 1995, para. 4(b)(i)) The two governments also committed to coordinating licensing terms, fees, and taxation, so that companies operating under the arrangement would face harmonized conditions regardless of which government had licensed them.

Why it collapsed

The mechanism lasted twelve years. On 27 March 2007, Argentina notified the UK it was terminating the declaration. Foreign Minister Jorge Taiana cited the UK's continued unilateral licensing activity outside the joint framework and, more fundamentally, that the arrangement had delivered no practical Argentine participation. The immediate technical cause was simpler: the Special Cooperation Area the declaration had defined turned out to hold no commercially exploitable reserves. The resource-rich ground — the North Falklands Basin — lay outside it, and British-licensed companies were already exploring there unilaterally.

That combination proved fatal to the cooperative model. As legal scholar Alice Ruzza observed shortly afterward, the declaration was always a political instrument rather than a binding treaty, a cooperative regime that Ruzza describes as "deemed to remain stable and self-sustaining insofar as the interests and choices of the parties converged" (Ruzza 2011, p. 92). Once the area it actually covered proved worthless and the real deposits lay elsewhere, outside the framework's scope, there was nothing left holding the cooperative model together.

The legal question the collapse exposed

International law generally treats title to a territory's natural resources as following title to the territory itself — the doctrine of Permanent Sovereignty over Natural Resources (PSNR), developed through a long line of UN General Assembly resolutions since the 1950s and recognized by the International Court of Justice as customary international law. Where sovereignty is settled, so is who owns what lies beneath the seabed. Where it is disputed, as over the Falklands/Malvinas, the question of who may lawfully authorize resource extraction has no equally settled answer.

Ruzza's analysis treats the 1995 Declaration as a real-world test of whether title to territory and title to resources can be lawfully separated. Her conclusion is qualified: separating them is not unlawful in itself, but only for as long as every state with a legitimate sovereign claim remains a party to the arrangement — which, given that UN practice and General Assembly resolutions on this question have consistently treated the dispute as involving only Argentina and the UK, meant the joint declaration met that bar while it lasted. Once Argentina withdrew, that changed. The UK's continued unilateral licensing, in her reading, no longer had the cover of both legitimate claimants' participation, and General Assembly Resolution 31/49's 1976 call for both governments to refrain from unilaterally modifying the situation over the islands cuts directly against exactly that kind of one-sided activity.

Ruzza goes further, arguing the stakes are asymmetric in a way ordinary sovereignty disputes are not. A wrongful assertion of territorial sovereignty can, in principle, be corrected later — a court or arbitral tribunal can restore the title to whoever it belongs to. A depleted oil reservoir cannot be un-depleted. If the exploitation underway is later found to have proceeded without the consent of the state actually entitled to license it, there is no remedy that restores the resource itself. On that reasoning, she argues, unilateral extraction while sovereignty remains genuinely contested is legally more exposed than the underlying territorial dispute alone would suggest — though this is her own analysis of an unsettled question, not a position adopted by any court, and the United Kingdom rejects its premise entirely: its own position, restated when it protested a 2013 Argentine law criminalizing unauthorized hydrocarbon activity, is that Argentine domestic law simply does not apply to the Falklands, and that the islands' own government regulates resource development there as an exercise of the islanders' right to self-determination, not as a matter requiring Argentine consent.

A road not taken: condominium

Ruzza's paper considers, and sets aside, one alternative that would have resolved the underlying problem rather than working around it: a condominium, in which two or more states formally exercise joint sovereignty over the same territory. The International Court of Justice recognized such an arrangement in Land, Island and Maritime Frontier Dispute (El Salvador v. Honduras, 1992), where it found Honduras, El Salvador, and Nicaragua held joint sovereignty over the waters of the Gulf of Fonseca, based on the gulf's specific history and the consistent, unprotested claims of all three states. A Falklands/Malvinas condominium would formally vest sovereignty in both Argentina and the UK simultaneously, ending the dispute over title rather than routing around it while leaving resource rights unresolved.

Neither government has ever proposed this, and Ruzza doubts either would: it would require both states to formally concede that the other holds an equally valid claim, a compromise reflected nowhere in either side's official position, and it takes no account of the Falkland Islanders' own consistent assertion of British sovereignty. It remains, in her words, a "tentative option" — a demonstration that a durable legal solution exists in principle, not a realistic one.

The dispute did not stay theoretical

Argentina's legal and diplomatic response to unilateral British licensing escalated well beyond withdrawing from the 1995 framework. A 2010 decree required any vessel moving between mainland Argentine ports and the Falklands, or carrying cargo connected to such a voyage, to obtain prior Argentine authorization. In March 2011, Argentina enacted Law 26,659, making unauthorized hydrocarbon exploration or exploitation on its continental shelf — a term its own domestic law extends to the waters around the islands — a criminal offense; a 2026 amendment proposal would toughen the penalties further. The UK's Foreign and Commonwealth Office formally protested a related 2013 amendment, calling it an attempt to obstruct lawful economic activity central to the islanders' right to self-determination.

The commercial stakes these measures target are now considerably larger than they were in 1995. Rockhopper Exploration first identified the Sea Lion field in the North Falklands Basin in 2010; on 10 December 2025, Rockhopper and its now-majority partner Navitas Petroleum (65%, against Rockhopper's 35%) took a final investment decision to develop it, at a projected cost of US$2.1 billion, with first oil targeted for 2028. Argentina's response followed within the year: on 16 September 2026, a court in Río Grande, Tierra del Fuego, ruled on a suit brought by an Argentine war-veterans' association and environmental lawyers, ordering Rockhopper and Navitas to halt all drilling and infrastructure work pending an environmental assessment. Whatever its ultimate legal effect, the ruling illustrates that the question the 1995 Declaration tried to set aside — who may lawfully authorize resource extraction in a territory whose sovereignty remains disputed — is not a historical curiosity. Three decades after the Joint Declaration was signed, it is still being litigated.