Enlargement DynamicsAs demonstrated, inherent Balkan nationalism inhibits progress and further integration with the EU. However, slow progress cannot be solely attributed to this as, perhaps, the main challenge to EU enlargement in the Western Balkans seems to come from within the Union itself. The EU’s approach to enlargement is increasingly determined by its own internal constraints and external challenges, raising serious doubts about its credibility and feasibility.
At the core of the problem is the diverging priorities of the member states, resulting in the inability to sufficiently guide political developments in the region. Internal EU dynamics are decisively influencing its attitude towards enlargement, as public opinion in many member states appears increasingly wary. There is a prevailing fear that instability from the Western Balkans could affect the EU, especially given the Union’s limited ability to counter third-party influence in the region is leading it to take a more restrained approach, prioritizing stability and reforms over rapid integration.
The problem is magnified by the EU’s limited influence on nationalist disputes within candidate countries. While the EU can offer significant incentives, in the form of financial aid, political support and the promise of future membership, its soft power has proven inadequate to resolve such conflicts. Even though EU integration offers long-term benefits in terms of economic development, political stability and security, the concessions required to achieve these goals often come with high political costs for domestic actors, with the EU simply lacking the hard power to push through. The absence of coercive mechanisms to enforce reforms or resolve disputes leaves the EU incapable to deal with internal divisions, especially in deep-rooted conflicts like those between Serbia and Kosovo or within Bosnia and Herzegovina.
Such rows between candidate states intertwine with the EU’s own internal skepticism about enlargement. Public opinion in many member states reflects an “enlargement fatigue”, originating from concerns about the burden on the Union’s institutions, the rollback of the rule of law in some of the more recent members such as Hungary and Poland and economic disparities with candidate countries. Moreover, some EU members are themselves increasingly ruled by nationalists and even sovereigntists, which further inhibits external action and internal cohesion.
This ties into the EU unanimity rule, which underscores its structural vulnerability. Any member state can exploit this rule to block candidate countries from joining due to bilateral disputes. Characteristic examples of this are the blockades of Greece and Bulgaria in the accession process of North Macedonia, as outlined earlier. In the Balkans, disputes are often fueled by a form of nationalism distinct from the civic kind, which emphasizes shared political values. Instead, the region's identity struggles are deeply rooted in ethnic, cultural and historical differences, often taking an exclusionary approach. This fosters unresolved tensions and competing claims that complicate regional relations and hinder the EU’s enlargement efforts. Local conflicts over national identity and historical differences thus escalate into broader pan-European challenges, perpetually delaying the region’s integration.
Such disputes amplify
distrust within the Western Balkans, exacerbating the challenges imposed by the EU’s structural shortcomings, hence creating a feedback loop that undermines regional progress. Political leaders in countries like Serbia and North Macedonia face pressures from nationalist constituencies that oppose concessions perceived as compromises to national sovereignty or identity. In Serbia, specifically, President Aleksandar Vučić has been careful not to alienate hardline nationalist voters who oppose any recognition of Kosovo’s independence. While Vučić has engaged in dialogue with Kosovo under European mediation, significant concessions remain politically costly, and progress has been stagnant. This reluctance to engage in meaningful reforms, especially in areas such as rule of law and regional cooperation, slows alignment with EU standards and delays accession prospects.
Without effective tools to address nationalist sentiments, the EU’s credibility as a mediator in the Western Balkans is weakened, leading countries in the region to question whether EU membership is genuinely attainable. As the EU prioritizes internal issues, such as immigration, economic recovery and strengthening democratic governance, the strategic importance of Western Balkan integration is often sidelined. This shift in focus risks creating disillusionment among Western Balkan populations, who increasingly feel misled by what they perceive as a lack of true EU commitment to their accession. Ultimately, many in the region now view the enlargement process as influenced more by the internal politics of EU member states than by a fair, merit-based system.