EUFOR Althea

EUFOR Althea is the European Union's longest-running military operation, launched on 2 December 2004 to succeed NATO's Stabilisation Force (SFOR) in Bosnia and Herzegovina. Its legal foundation rests on three interlocking instruments: United Nations Security Council Resolution 1575 (2004), which authorised a multinational stabilisation force under Chapter VII of the UN Charter; Council Joint Action 2004/570/CFSP of 12 July 2004, the EU legal act establishing the mission under what was then the European Security and Defence Policy (now the Common Security and Defence Policy, CSDP, codified in Articles 42–46 of the Treaty on European Union); and the so-called "Berlin Plus" arrangements concluded between the EU and NATO on 17 March 2003, which permit the EU to draw on NATO assets and capabilities. Althea remains the principal operational test case of Berlin Plus, and its continued existence depends on annual UNSC reauthorisation.

The chain of command reflects the Berlin Plus architecture. Political control and strategic direction are exercised by the EU's Political and Security Committee (PSC) in Brussels, which reports to the Council of the European Union. The Operation Commander is, by virtue of the Berlin Plus framework, NATO's Deputy Supreme Allied Commander Europe (DSACEUR), headquartered at SHAPE in Mons, Belgium. The Force Commander on the ground heads EUFOR Headquarters at Camp Butmir in Sarajevo — a facility shared with NATO Headquarters Sarajevo. Force generation proceeds through conferences convened by the EU Military Staff (EUMS), with troop-contributing nations including both EU member states and third states such as Switzerland, Türkiye, Chile, and North Macedonia. Rules of engagement are issued by the Council; tactical reporting flows upward through Mons to the PSC.

Operationally, Althea has evolved through three distinct phases. The initial 2004 deployment fielded approximately 7,000 troops organised in three Multinational Task Forces covering the entire territory of Bosnia and Herzegovina, essentially mirroring SFOR's footprint. A reconfiguration in 2007 reduced the force to roughly 2,500. From 2012 onward, the mission pivoted to a non-executive capacity-building and training role, with a small executive reserve retained for deterrence; troop strength fell to around 600. Following the Russian invasion of Ukraine on 24 February 2022, the Council reinforced Althea, restoring strength to roughly 1,100 and later to approximately 1,500, with reserve battalions on call from Austria, Hungary, Romania, and Bulgaria. The mission's core executive task remains ensuring compliance with Annexes 1-A and 2 of the Dayton Peace Agreement of 14 December 1995.

The contemporary chain of political oversight runs from Brussels through several named actors. The Council, on recommendation from the High Representative for Foreign Affairs and Security Policy (Kaja Kallas, from December 2024), renews the operation's mandate; UNSC Resolution 2706 (2023) and successor resolutions have extended the executive authorisation for twelve-month periods, with Russian abstention or acquiescence — a recurring point of diplomatic anxiety in the Sarajevo presidency and the embassies of the Peace Implementation Council Steering Board. EUFOR coordinates closely with the Office of the High Representative (OHR), led since 1 August 2021 by Christian Schmidt, and with the EU Special Representative in Bosnia and Herzegovina. Force Commanders rotate annually; Austria has provided the post on multiple occasions, reflecting Vienna's sustained Balkan engagement.

Althea must be distinguished from several adjacent constructs. It is not a NATO mission: NATO Headquarters Sarajevo runs in parallel, focusing on defence reform and Bosnia's Membership Action Plan track. It is not a peacekeeping operation under direct UN command, unlike UNMIBH (which preceded it) or MINUSCA elsewhere; the UN merely authorises, while command lies with the EU. It differs from EULEX Kosovo, which is a civilian CSDP rule-of-law mission without an executive military component. And it should not be conflated with the EU Military Assistance Mission in support of Ukraine (EUMAM Ukraine), launched in October 2022, which is a non-executive training mission outside any Berlin Plus framework.

Several controversies attend the mission. The Russian Federation, as a permanent UNSC member, has periodically signalled that it may veto reauthorisation, particularly amid disputes over Republika Srpska's secessionist rhetoric under Milorad Dodik and the use of the OHR's Bonn Powers — most prominently Schmidt's July 2023 imposition of amendments criminalising non-implementation of Constitutional Court decisions. A Russian veto would terminate the executive mandate and force the EU either to fall back on a non-executive posture under host-nation consent or to withdraw. A second debate concerns whether Althea should transition fully to an EU-only command structure independent of Berlin Plus — a recurring proposal blocked by Türkiye's reservations regarding Cyprus's access to NATO planning. The 2022–2023 reinforcement also exposed shortfalls in EU rapid-response capacity that fed directly into the design of the EU Rapid Deployment Capacity envisaged by the Strategic Compass adopted on 21 March 2022.

For the working practitioner — desk officer, EEAS analyst, or Sarajevo-based diplomat — Althea is the indispensable reference point for three reasons. It is the live demonstration that EU–NATO operational cooperation under Berlin Plus functions; it constitutes the EU's principal hard-power lever in the Western Balkans accession process; and it is the mission whose annual UNSC renewal serves as a barometer of great-power tolerance for European autonomous action in a contested neighbourhood. Tracking the September–November reauthorisation cycle in New York, the force generation conferences in Brussels, and the political-military assessments produced by EUFOR HQ Sarajevo is therefore a standing requirement for anyone covering the CSDP or the Dayton order.