By Simos A. Angelides*
The SBA’s of Akrotiri and Dhekelia represent a unique anomaly in international law, stemming from Cyprus's continuing incomplete decolonization process. These areas comprise approximately 3% of Cyprus's territory and remain under British control, purportedly as sovereign territories. However, their status raises profound questions about sovereignty, self-determination and compliance with contemporary, binding international norms. This opinion examines their legal status, explains their lack of sovereignty despite British claims and outlines available legal challenges.
The SBAs were retained by the United Kingdom (UK) as a precondition of granting independence to Cyprus in 1960, following years of colonial rule and anti-colonial struggle. This arrangement was part of a broader package including the Treaty of Guarantee and Treaty of Alliance, involving Greece, Turkey, and the UK as guarantors. The SBAs serve primarily military purposes. Recent events, such as the drone strike, underline the risks they pose to Cypriot security and its people, prompting renewed scrutiny.
Legal Status of the SBAs
The SBAs' legal foundation is based upon:
The British Parliament Cyprus Act 1960 (29.7.1960) which stipulates in Article 2 that:
“The Republic of Cyprus shall comprise the entirety of the Island of Cyprus with the exception of the two areas defined […]” and
the Treaty of Establishment, signed on August 16, 1960 which envisages in Article 1 that:
“The territory of the Republic of Cyprus shall comprise the island of Cyprus, together with the islands lying off its coast, with the exception of the two areas defined in Annex A to this Treaty, which areas shall remain under the sovereignty of the United Kingdom”.
This Treaty delineates the SBAs as territories over which the UK retains sovereignty, excluding them from the Republic of Cyprus (RoC) jurisdiction. Article 2 obliges the RoC to cooperate in ensuring the "security and effective operation" of the bases. The UK administers the SBAs as British Overseas Territories (BOTs), governed by the Sovereign Base Areas Administration under a senior military officer. Their legal system is based on the laws of the Colony of Cyprus as of 1960, amended as needed, and distinct from both UK and Cypriot domestic law.
The SBAs are not integrated into the UK proper but are treated as BOTs. They fall under EU customs territory per Protocol 3 of Cyprus's 2003 EU Accession Treaty, a status preserved post-Brexit via the UK Withdrawal Agreement and a special Protocol contained therein specifically. The UK exercises full jurisdictional control, including thousands of Cypriots residing therein, who are deemed RoC citizens but subject to SBA courts. Restrictions prohibit commercial development, emphasizing their military exclusivity, though a 2014 Non-Military Development Agreement allows limited civilian use pending implementation.
Why the SBAs are not in reality Sovereign
Despite the Treaty's language, the SBAs legally and factually lack genuine sovereignty under modern international law. Primarily because they constitute colonial remnants violating the right to self-determination and decolonization principles and norms. Sovereignty implies absolute territorial control and this is not the case as shall be explained below. The SBAs' creation was imposed as a precondition for Cyprus's independence, undermining voluntary consent and clear duress during ratification. The UK refused to recognize the RoC until sovereignty over the bases was secured, rendering the arrangement coercive, which in itself renders the agreement null and void.
The UN Declaration on the Granting of Independence to Colonial Countries and Peoples (Resolution 1514(XV), 1960) prohibits the partial disruption of a colonial territory's integrity during decolonization reaffirming the principle that the territorial integrity of the emerging state must be preserved.
Equally the principle of self-determination contains a prohibition on excision of colonial territory prior to or at the time of independence. By detaching the SBAs from the rest of the island, the UK fragmented Cyprus's territory, breaching this crucial and binding international law norm.
The SBAs are not independent or sovereign as they lack legislative autonomy and are administered solely for military purposes, as Appendix O of the Treaty explicitly limits British authority by prescribing, "not to set up and administer colonies," yet the SBAs function as such, with Cypriot inhabitants denied their full rights. This was affirmed by the RoC Supreme Court, which described them as "areas... over which the United Kingdom... retained its sovereignty, subject to restrictions.
The UK's "sovereignty" is qualified, purpose bound, functionally restricted and conditional. It has delegated administration, jurisdictional hybridity and legal harmonization obligations. It must inter alia respect RoC cooperation obligations and cannot expand beyond military use.
Operations have exceeded the Treaty, including non-defensive actions like strikes or support for third countries, violating Article 3's security guarantees. This perpetuates British influence without full accountability or legality. The UK's Supreme Court in R (Bashir) v Secretary of State for the Home Department [2018] UKSC 45 confirmed the SBAs as "the rump of the British colony of Cyprus," not new entities, affirming their colonial character and held that "The Cyprus Act 1960 did not alter the status of the SBAs, but merely excluded them from the transfer of territory to the new Republic of Cyprus... the only change which occurred in 1960 was that whereas they had previously been part of the Colony of Cyprus, thereafter they were a separate territory under UK sovereignty" . The Court characterized the SBAs as a "relict" of the former colony.
Key Legal Arguments and Relevant Case Law
Incomplete Decolonisation and Violation of the right to Self-Determination, Article 1(2) of UN Charter and UNGA Res 2625(1970): A central legal argument concerns unfinished decolonization. The International Court of Justice (ICJ) Advisory Opinion on the Legal Consequences of the Separation of the Chagos Archipelago from Mauritius (2019) is directly analogous and applicable. The ICJ held that detaching territory for military bases during decolonization violates self-determination, as consent was not freely given amid colonial pressure. In Cyprus, independence was conditional on SBA retention, mirroring Chagos. The ICJ emphasized that such detachments before independence without free/genuine consent violate the right of self determination as well as territorial integrity and breach Resolution 1514, rendering the arrangement incomplete decolonization (paras. 160–172). The Court’s advice is a ‘legal tool’ the Cypriot government can use to renegotiate the status of the Areas as it shows that the SBAs' creation was unlawful.
- Continuing consent: Self-determination demands ongoing, revocable consent. Cypriots in the Bases lack meaningful input; no referendum endorsed retention and as argued by the Cyprus Government before the ICJ in the Chagos case, there is no continuing consent by the people of Cyprus vis a vis the current situation.
- Jus cogens and treaty validity: As aforementioned the Treaty of Establishment conflicts with the right of self-determination then according to the Vienna Convention on the Law of Treaties (VCLT), Articles 53 (A treaty is void if it conflicts with a peremptory norm of international law), 64(A treaty becomes void if a new peremptory norm emerges that conflicts with it), the specific Treaty of Establishment provisions, in relation solely to the Bases are rendered void ab initio or obsolete.
- Rebus sic stantibus: VCLT Article 62, allows a treaty to be terminated or withdrawn due to a fundamental, unforeseen change in circumstances that formed an essential basis of the parties' consent. It serves as an exception to the principle of pacta sunt servanda (agreements must be kept). Indicatively fundamental changes since 1960 (1974 invasion/occupation, refugee crisis, post-Brexit EU dynamics, regional militarization) radically transform obligations and any initial basis.
- Breach of Territorial Integrity: Under Article 2(4) of the UN Charter, states must respect territorial integrity. The SBAs fragment Cyprus, and UK operations risk Cypriot security, as seen in recent drone incidents, thus violating this core principle.
- Human Rights Implications: The European Court of Human Rights (ECtHR) in Cyprus v. Turkey (2001) addressed occupation but could extend to SBAs if rights violations occur for Cypriot residing their. In Bashir v. Secretary of State [2017] EWCA Civ 397, the UK Court of Appeal ruled the 1951 Refugee Convention applies to SBAs, rejecting the UK's non-extension argument and affirming their colonial continuity. This implies broader international obligations such as the ECHR bind the UK.
Violations of Treaty Obligations by the United Kingdom
The United Kingdom has arguably violated several provisions of the Treaty of Establishment and of course their obligations under the Treaty of Guarantee (for which this opinion will not elaborate).
1.Appendix R (Financial Assistance)
The treaty envisaged financial assistance from the UK to Cyprus. Reports indicate that such payments ceased in 1965. This constitutew a material breach of treaty obligations. Under Article 60 of VCLT, a material breach may justify termination or suspension of a treaty.
2. Expansion of Civilian Activity
Appendix O provides that the bases should not be developed for non-military purposes. However, in recent decades Residential areas have expanded, Commercial activity has developed. These developments could be argued to exceed the original military purpose.
3. Exceeding Treaty Framework
UK activities such as intelligence gathering beyond defense violate the Treaty's military-only purpose. The UK Supreme Court in Bancoult v. Secretary of State [2008] UKHL 61 (Chagos) scrutinized colonial powers, holding arbitrary detachment unlawful.
Strategy for a Successful Challenge / Available Pathways
The RoC has several avenues to challenge the SBAs and a calibrated, multi-track strategy maximizes prospects for success:
1.Negotiation and Treaty Revision
The primary/immediate step would be to request formal renegotiation of the legal regime governing the bases. This could involve, Converting the bases into leased military installations, Creating joint administration, Limiting British presence to strictly defined defence purposes with the concurrent opinion of Cyprus, phased withdrawal. Leverage 2026 incident risks and Chagos precedent (UK-Mauritius 2025 sovereignty transfer). Public pressure (protests, campaigns) strengthens this position.
2.ICJ Possible Routes
a) Advisory Opinion
Cyprus could seek an Advisory Opinion through the UN General Assembly and request for an opinion on: (i) whether SBA retention constitutes incomplete decolonisation post-Chagos; (ii) consequences for UK administration. Chagos success (UK obligation to end administration) provides direct analogy; Cyprus's prior support in that case bolsters legitimacy. Non-binding but politically potent. Success could pressure the UK to negotiate relinquishment.
b) Contentious Case
If the UK accepts jurisdiction due to treaty reservations regarding jurisdiction of ICJ via a vis commonwealth States, Cyprus could initiate litigation concerning treaty validity or territorial sovereignty.
3. UN Decolonization Committee (C-24)
Cyprus could Petition as a non-self-governing territory / colonial remnant, urging compliance with Resolution 1514. Building simultaneously momentum for GA resolution. This body has historically examined cases of colonial territories and may support the argument that the SBAs represent a remaining colonial enclave.
4. ECtHR Proceedings or EU Mechanisms
Interstate or individual claim if SBA actions violate and infringe Cypriot rights (e.g., property restrictions, free elections, movement, environmental regulations). Post-Brexit, argue UK sovereignty impairs EU acquis application in RoC territory. The Additional Protocol's non-extension to SBAs could be contested as discriminatory.
5. Domestic Litigation and Political Advocacy
In RoC courts Treaty interpretations can be challenged, invoking constitutional provisions on sovereignty while simultaneously the RoC strengthens alliances and highlights security threats.
Legal and Factual Challenges: The Treaty is currently binding; guarantor consent needed; UK strategic interests remain at all times robust. However, evolving norms, Chagos compliance, and 2026 vulnerabilities weaken intransigence and inviolability.
Thinking out of the Box
The UK, RoC and the EU, could come to a mutual agreement and change the regime into EU bases used only for defense purposes protecting the Eastern Mediterrenean. This could in future evolve also to a possible NATO base, should the RoC join NATO in the future, thus establishing an effective defence mechanism protecting Europe and NATO members from any threat arriving from the East.
Conclusion and Recommendations
The SBAs are not truly sovereign but colonial vestiges, sustained by a coerced treaty that contravenes self-determination, complete decolonization and territorial integrity. Case law from ICJ (Chagos) provides authoritative precedent, UK courts (Bashir, Bancoult), and scholarly parallels provide robust arguments for challenge. The 2026 drone strike underscores risks, shifting political calculus. The RoC should consider a calibrated legal strategy, beginning with a formal request for bilateral negotiations based on the "continuing consent" doctrine, while preparing the groundwork for potential international adjudication should those negotiations fail to address the fundamental inconsistencies identified. An ICJ advisory opinion, complemented by diplomatic pressure, mobilized support and international advocacy will affirm Cypriot rightful sovereignty and territorial integrity while addressing UK interests, notwithstanding the possibility of evolving into a collective EU base or even a NATO base in the future.
*Simos Angelides is an Advocate