Introduction
On 9 July 2026, South Sudan marked fifteen years since it seceded from Sudan to become Africa’s youngest state. The anniversary invites celebration, but it also demands sober reckoning. Independence was meant to close a chapter of marginalization, war, and underdevelopment; instead, the intervening decade and a half has been defined by recurrent civil war, a fractured peace process, and a democratic transition that keeps receding into the future. What is apparent is that South Sudan at fifteen has not merely stagnated but has regressed: the power-sharing arrangement that ended the 2013–2018 civil war has effectively collapsed, ethnic polarization between Dinka and Nuer communities has deepened at the very apex of the state, and the country’s chronic institutional weakness has left it unable to convert regional and continental integration into tangible peace dividends.
South Sudan’s fragility is not merely a domestic concern; it is a transnational security liability whose spillover effects cut across the Horn of Africa and the wider Great Lakes region. Although the new state was created to remedy the marginalization, racial and religious exclusion, and infrastructural neglect that South Sudanese communities endured under successive Khartoum governments, the last fifteen years have reproduced rather than resolved these grievances in a new version: political power remains concentrated along ethnic lines, infrastructural investment remains minimal outside Juba, and the economy remains almost entirely dependent on volatile oil revenues. This article examines four interlocking dimensions of that unfinished transition: the collapse of the country’s power-sharing framework, the repeated deferral of democratic legitimation through elections, the deepening of ethnic polarization and institutional collapse, and South Sudan’s underperformance within regional and continental integration frameworks – before considering what, if anything, can still be done.
Demystifying the Revitalized Peace Agreement
The 2018 Revitalized Agreement on the Resolution of the Conflict in South Sudan (R-ARCSS) was the second attempt, after the 2015 accord collapsed into renewed fighting, to reconcile President Salva Kiir and his longtime rival, First Vice President Riek Machar, within a government of national unity. For several years the arrangement held, however imperfectly, sustaining an uneasy coexistence between the Sudan People’s Liberation Movement (SPLM) and Machar’s SPLM-in-Opposition. That coexistence effectively ended in 2025. Fighting between government forces and the Nuer-aligned White Army militia in Nasir, Upper Nile State, in March 2025 left hundreds of soldiers dead and precipitated a sweeping crackdown. President Kiir’s government detained several of Machar’s allies, including his petroleum minister and the army’s deputy chief, and placed Machar himself under house arrest. By September 2025, Machar and seven co-defendants had been formally charged with murder, treason, and crimes against humanity, and a special court was convened for the sole purpose of trying them. Machar’s own party responded by declaring the R-ARCSS defunct.
The consequences have been dire. With the country’s first vice president incapacitated and his political base under siege, the central bargain informing the unity government has dissolved in practice even where it survives on paper. Fighting that began in Upper Nile spread into Jonglei State by late 2025, displacing communities and disrupting humanitarian access, while reports through the first half of 2026 point to a steady escalation rather than de-escalation. Machar’s prosecution is characterized as less a genuine accountability mechanism than a vehicle for President Kiir to eliminate his principal rival and consolidate power ahead of elections. Unfortunately, the trial has already achieved what a decade of mediation sought to prevent: the formal unraveling of the power-sharing framework that international guarantors treated as the anchor of South Sudan’s peace.
Democracy Deferred
South Sudan’s transitional constitution originally envisioned national elections by 2015. Fifteen years on, the country has not held a national election. The vote has been postponed five times, most recently in mid-2024, when Kiir and Machar agreed to push the date to 22 December 2026. That date now looms as the fifteenth anniversary gives way to a critical election year, yet the preconditions long identified as essential, that is, a permanent constitution, a completed census, unification of the country’s fragmented security forces, and functioning electoral institutions, remain substantially unmet. The transitional government has repeatedly cited technical unreadiness as grounds for delay, but it is clear that successive postponements have chiefly served to extend the incumbency of a leadership never subjected to a popular mandate.
The credibility of the December 2026 poll is already compromised by the removal of the leading opposition figure from the political arena. With Machar under prosecution and his party’s legitimacy contested, meaningful competition is difficult to imagine, and some regional partners have foreseen a further technical postponement into 2027 or a phased approach separating executive from legislative contests. Alongside electoral uncertainty, civic and human rights space has continued to shrink, with restrictions on dissent, media, and civil society organizing amplifying the state’s legitimacy deficit. A state that governs without electoral sanction, and that now faces a contested transition to the polls, cannot easily claim the institutional legitimacy that stable peace requires.
Ethnic Polarization
One of the dominant indicators of South Sudan’s fragility is the persistence and deepening of ethnic polarization, particularly between Dinka and Nuer communities, at the very center of state power. President Kiir, a Dinka, and Machar, a Nuer, have anchored their decades-long rivalry in ethnically defined military and political constituencies since well before independence, and the events of 2025–2026 have intensified rather than dissolved that division. The Ethnic Security Dilemma helps explain the dynamic: in a context of weak central authority and unreliable security guarantees, each community’s leadership perceives its own armed mobilization as necessary for survival, a logic that produces a self-reinforcing cycle of distrust and confrontation rather than resolution. Regional Security Complex Theory further illuminates why this internal polarization cannot be contained within South Sudan’s borders: neighboring states’ security is bound up with Juba’s stability through shared ethnic constituencies, refugee flows, and the involvement of external military actors in South Sudan’s internal battles.
Beyond elite rivalry, structural indicators of fragility have worsened. The state’s capacity to deliver basic public goods such as security, health, and education continues to decline. This has prompted communities to organize their own militias for protection, a substitution that further entrenches armed fragmentation. Preventable diseases have risen amid weak health infrastructure, and chronic underinvestment in education threatens the human capital base needed for any future recovery. Institutional capacity remains limited by constrained budgets and personnel shortages, limiting the state’s ability to translate policy commitments into implementation. South Sudan’s continued dependence on oil revenue, combined with an undiversified economy, leaves state finances acutely vulnerable to global price shocks and pipeline disruptions, further weakening the fiscal base for governance and reconstruction. State legitimacy, already fragile in the absence of any democratic transition, is further eroded by the government’s evident willingness to use the machinery of criminal prosecution against its principal political rival, a pattern that reinforces perceptions among Nuer and allied communities that the state functions as an instrument of one constituency rather than an impartial arbiter among all.
A Reluctant Regional Partner
South Sudan has pursued membership in regional and continental organizations – the East African Community (EAC), the Intergovernmental Authority on Development (IGAD), and the African Union (AU) – yet has struggled to tap into the benefits of integration. Having joined the EAC in 2016, South Sudan only ratified the EAC Treaty in 2025, nearly a decade later, and its recent introduction of new visa fees for citizens of fellow EAC members sits uneasily alongside its stated commitment to free movement within the bloc. As of mid-2026, South Sudan remained one of only a handful of African Union member states, alongside Benin, Libya, and Sudan, yet to ratify the African Continental Free Trade Area (AfCFTA) agreement it signed years earlier, forgoing preferential access to a continental market of some 1.4 billion people even as its neighbors deepen trade integration.
IGAD, as midwife to the 2018 peace agreement, has remained engaged in South Sudan’s peace process. However, Juba’s preference for unilateral action in security matters has repeatedly deflated the bloc’s efforts. The AU has maintained pressure for credible, peaceful elections, yet its influence has been curtailed by the same deficits of political will and institutional capacity that afflict domestic governance. The result is a state that participates in the architecture of regional integration without absorbing its stabilizing or developmental benefits: a pattern consistent with broader findings on fragile states’ selective and often symbolic engagement with regional institutions.
Can Coercive Diplomacy Remedy the Situation?
Fifteen years after independence, South Sudan confronts a host of unfavorable trends: a collapsed power-sharing arrangement, an uncertain path to first elections, deepening ethnic polarization at the summit of the state, and regional integration that remains more declaratory than substantive. These dynamics unfold against a deteriorating global backdrop of shrinking international aid budgets, intensifying major- and middle-power rivalries across Africa, and mounting climate stress – all of which narrow the external resources historically available to handle fragile transitions. Left unaddressed, South Sudan’s fragility risks functioning as an incubator of transnational insecurity, generating refugee flows, arms proliferation, and militia activity that extend well beyond its borders into an already volatile Horn of Africa.
Forestalling this trajectory will require regional and continental bodies to move beyond declaratory diplomacy toward well-calculated coercive-short-of-war instruments – targeted sanctions, conditional suspension of privileges, and sustained diplomatic pressure tied to concrete benchmarks on security sector reforms, electoral preparation, and human rights protections. Equally, credible pressure must be paired with genuine political inclusion, ensuring that any electoral process, however imperfect, is not simply an instrument for entrenching incumbency but a genuine step toward accountable governance. Short of that well-calculated strategy, South Sudan’s fifteen years of independence will mark not a milestone of progress but a warning of protracted instability, with peace and security remaining, as they have been since 2011, largely elusive.
