When NATO parliamentarians gathered in Dayton, Ohio, in late May 2025 for their spring session, the symbolism was deliberate. Thirty years earlier, American diplomats had brokered the accords that ended the Bosnian war at Wright-Patterson Air Force Base in the same city. The NATO Parliamentary Assembly used the anniversary to reaffirm allied unity, call for a stronger NATO, and reiterate support for Ukraine—linking the Dayton legacy of peace enforcement and institution-building to today's deterrence and resilience agenda.
But behind the ceremony lies a harder question. The Dayton Peace Accords halted a conflict that killed approximately 100,000 people and displaced millions. They created a constitutional architecture held in place by international oversight, military backstops, and EU accession incentives. As that framework reaches its fourth decade, Bosnia and Herzegovina faces a choice: lock in the European path through sustained reform, or allow domestic obstruction and wider European distraction to erode what Dayton built.
What Dayton constructed
The accords initialled at Wright-Patterson on November 21, 1995 and formally signed in Paris three weeks later established Bosnia and Herzegovina as a single state composed of two entities—the Federation of BiH and Republika Srpska—plus the Brčko District. The Office of the High Representative implements civilian aspects of the agreement, wielding "Bonn powers" to impose decisions and remove obstructive officials. NATO's Implementation Force gave way to a smaller Stabilisation Force, which in 2004 handed executive security responsibilities to the EU Force Althea.
EUFOR Althea operates under a UN Security Council Chapter VII mandate to maintain a safe and secure environment and implement the military annexes of the Dayton framework. The UN renewed that mandate most recently on October 31, 2025, through Resolution 2795. EUFOR retains authority to re-assume full control if required, and its in-theatre personnel can be augmented rapidly under Berlin Plus arrangements with NATO. The mission deploys liaison and observation teams across the country, maintains a multinational battalion, and conducts counter-improvised threat and demining operations.
This institutional scaffolding—OHR oversight, EUFOR presence, and EU accession conditionality—has kept the peace. But it has not resolved the constitutional paralysis baked into Dayton's ethnic-parity structure, where vetoes can freeze reform and nationalist elites can instrumentalize grievance for political gain.
Where the system stalls
Republika Srpska leadership has mounted what UN Security Council briefings and OHR reporting describe as "unprecedented attacks" on the Dayton constitutional order. Separatist rhetoric, legal initiatives challenging the authority of state institutions and the High Representative, and claims that Dayton permits entity secession have drawn repeated international censure. UN officials have warned that "wrong interpretations of Dayton" serve secessionist goals and that only one country exists on BiH territory.
Milorad Dodik, the RS president, has faced first-instance conviction and legal pressure related to defying High Representative decisions. His administration has tested the limits of international patience, asserting entity primacy and questioning the legitimacy of state-level courts and security structures. The result is governance gridlock: reforms required for EU accession stall in entity vetoes, while the prospect of instability keeps EUFOR and OHR engaged.
This is not accidental. The Dayton settlement entrenched ethnic vetoes as a conflict-termination device. Thirty years on, those same mechanisms enable obstruction. EU accession conditionality is designed to counter this dynamic by tying financial and political benefits to concrete steps toward a functional, unified state. But conditionality only works if Brussels maintains leverage—and if the security backstop remains credible.
Members are reading: How Europe's distraction and BiH's conditional EU funding test whether Dayton's institutional scaffolding can still compel reform—or merely delay instability.
The institutional stamina test
Dayton's lesson is not only that ceasefires can be engineered. It is that peace becomes durable when institutions outlast the initial enforcement moment. Thirty years on, that patience is tested by domestic elites who exploit constitutional vetoes, a European Union juggling enlargement with existential defense questions, and an American political class periodically debating the value of Balkan engagement.
The NATO PA session in Dayton and the December statements from Brussels and Washington reaffirm the commitment. The Commission's approval of the Reform Agenda offers a concrete pathway: sign the agreements, meet the conditions, unlock the funds, and advance toward membership. EUFOR's renewed mandate and OHR oversight provide the deterrent that makes that pathway credible. But credibility requires sustained attention, political will, and the willingness to augment resources if stability is threatened.
Bosnia and Herzegovina's European future hinges on coupling those security guarantees with real reform delivery. The alternative is not a return to war—the international scaffolding makes large-scale conflict unlikely—but chronic instability, economic stagnation, and the slow erosion of the institutions that made peace possible. Thirty years after Dayton, the choice is whether Europe has the institutional stamina to finish what it started.
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