Serbia`s rapid military modernization, strategic planning, and hybrid operations are emerging as the central security threat to Kosovo and regional stability in the Western Balkans. Between increased defense spending, the acquisition of advanced weapons including CM-400 supersonic ballistic missiles from China, and opaque arms logistics, Belgrade is systematically enhancing its conventional and strategic capabilities. Political rhetoric and “Military Plan 2030” signal that Kosovo is explicitly considered within Serbia`s long-term military calculations. The September 2023 Banjska attack, orchestrated by Milan Radoičić, demonstrates the ongoing use of proxy actors to destabilize Kosovo, while Radoičić`s continued freedom in Serbia highlights enforcement gaps. Additionally, secretive cargo flights and international arms partnerships expand Serbia`s operational reach. The convergence of these factors creates a structural asymmetry in which Kosovo is vulnerable to coercion, intimidation, and hybrid attacks. Immediate international engagement, accountability for past proxy attacks, and monitoring of Serbia`s militarization is critical to preventing renewed instability in the region.
Serbia`s military build-up, a growing threat to regional stability
The Western Balkans are once again facing a mounting security crisis, driven primarily by the deliberate rearmament and militarization of Serbia. According to the Stockholm International Peace Research Institute, military spending across the region has risen significantly, but Serbia has emerged as the dominant military actor, importing the largest share of major weapons systems. Beyond quantity, Serbia is also acquiring advanced, strategic weaponry. In March 2026, President Aleksandar Vučić confirmed the purchase of CM-400 supersonic ballistic missiles from China, representing a qualitative leap in the country`s ability to project military power across the Balkans.
This rearmament is not abstract: it alters the structural balance of power in the region. Kosovo, with its limited military capabilities, faces a stark asymmetry, leaving it vulnerable to strategic coercion, intimidation, or direct action. Serbia`s military modernization, combined with its historical refusal to recognize Kosovo`s independence, demonstrates that Belgrade is positioning itself to leverage both conventional and irregular forces to maintain dominance in the region.
Strategic plans and provocative rhetoric: Kosovo in the crosshairs
Serbia`s threat is not confined to material military capabilities. Strategic planning and political rhetoric indicate that Kosovo is explicitly on Serbia`s agenda. Vučić`s “Military Plan 2030” reportedly includes contingency considerations regarding Kosovo, signaling the potential for coercive action. Such statements are not isolated: they are accompanied by aggressive narratives that frame Kosovo as an unresolved national issue.
Neighboring states have recognized the gravity of these signals. Edi Rama warned publicly that any attempt to “touch” Kosovo would inevitably draw in Albania too.
Serbia`s threat extends beyond conventional capabilities. The September 2023 attack in the village of Banjska demonstrated the lethal potential of proxy operations. Armed militants attacked Kosovo police forces in a well-coordinated assault that resulted in casualties and exposed persistent vulnerabilities in Kosovo`s northern regions.
The attack was orchestrated by Milan Radoičić warrant and international mechanisms such as Interpol seeking his prosecution, Radoičić remains in Serbia, never surrendered to justice, and now reportedly commands a force of 200 individuals acting as personal protection linked to President Vučić. This demonstrates that non-state actors and hybrid networks can operate with impunity, creating persistent destabilization risks for Kosovo without triggering full-scale war.
The Banjska case illustrates that Serbia possesses both the motive and the mechanisms to exert pressure on Kosovo through proxies, using hybrid tactics to undermine sovereignty while avoiding direct international confrontation.
Shadow arms transfers and strategic partnerships: Serbia`s expanding reach
The threat posed by Serbia is also amplified by opaque arms logistics and strategic partnerships. Investigations by Radio Free Europe/Radio Liberty documented multiple flights between Tel Aviv and Belgrade operated by Challenge Airlines IL. These aircraft, capable of transporting heavy or sensitive cargo including weapons, completed at least nine flights in February and March 2026, shortly after escalations in the Middle East.
Neither the Serbian government nor the airline disclosed the nature of these shipments, leaving open questions about Serbia`s ability to procure advanced military equipment clandestinely. Coupled with partnerships in China and other global suppliers, Serbia is building an arsenal and logistical network that is both sophisticated and opaque, enhancing its ability to project power and conduct operations in a way that regional observers cannot fully monitor or predict.
Kosovo`s vulnerability, structural imbalance and emerging risks
Kosovo faces a converging set of threats: structural military asymmetry, direct political pressure, and irregular proxy attacks. Serbia`s growing arsenal, combined with strategic planning that explicitly involves Kosovo, creates the risk that any escalation, political or military, could quickly translate into localized or even regional instability. The Banjska attack and Radoičić`s continued freedom demonstrate that Serbia can destabilize Kosovo indirectly, exploiting legal and enforcement gaps to maintain leverage.
The Western Balkans are therefore at a critical security juncture. Kosovo`s survival depends not only on internal resilience but on strong international engagement, intelligence sharing, and enforcement of accountability for past acts of violence. Without immediate strategic attention, Serbia`s continued militarization, political signaling, and use of proxy networks could trigger a destabilization spiral, undermining regional stability and threatening Kosovo`s sovereignty.
Serbia as the central threat to Kosovo and the Western Balkans
The main danger for Kosovo is not hypothetical, it is already present. Serbia`s combination of conventional military superiority, strategic planning targeting Kosovo, hybrid tactics through proxy networks, and opaque global arms logistics establishes it as the central threat in the Western Balkans. The Banjska incident serves as a warning that Serbia can destabilize Kosovo indirectly while maintaining plausible deniability, using paramilitary proxies and irregular networks to maintain leverage.
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For Kosovo, this asymmetry requires urgent strategic and international measures. Failure to address these risks could allow Serbia`s militarization and hybrid operations to escalate into recurring crises, undermining Kosovo`s security and threatening the stability of the entire Western Balkans. The evidence is clear: Serbia is no longer a passive neighbor, it is a reasserting power with the capacity and will to influence, intimidate, and destabilize its smaller neighbors.
