The fragile stability underpinning Perikatan Nasional appears increasingly precarious as factional tensions between its two largest components—PAS and Bersatu—have deteriorated beyond reconciliation into what seasoned observers characterize as an uncontrolled conflict. Yusri Ibrahim, chief researcher at the Ilham Centre, contends the coalition has transitioned from a period of manageable disagreements into a "guerrilla war" phase, suggesting that behind-the-scenes maneuvering and targeted political strikes have replaced diplomatic channels as the primary mode of interaction between the two parties.

The deterioration of relations between PAS and Bersatu strikes at the very foundation of Perikatan Nasional's coherence. When the coalition was formally established, the partnership was premised on complementary strengths: Bersatu's claim to represent reformist credentials and former establishment figures, alongside PAS's extensive grassroots organization and religious constituency support. Yet this division of labour has proven unstable, with both parties competing for influence over the coalition's direction, policy agenda, and electoral strategy across multiple regions.

The term "guerrilla war" employed by Ilham Centre analysts carries particular significance in the Malaysian political context. Rather than indicating imminent dissolution through dramatic defections or public confrontations, it suggests a grinding campaign of incremental damage—backroom maneuvers to undermine rival party interests in state governments, selective withholding of cooperation in parliamentary votes, and competing narratives aimed at consolidating support among overlapping voter bases. This asymmetric form of political competition leaves the coalition structure formally intact while hollowing out its functional capacity.

Bersatu's vulnerabilities in this power struggle are particularly acute. The party entered Perikatan Nasional as the senior coalition partner and primary vehicle for opposition to the Anwar Ibrahim-led government. However, its smaller parliamentary representation compared to PAS, combined with organizational challenges stemming from internal divisions, has constrained its ability to dictate coalition direction. State-level contests have become flashpoints, with both parties maneuvering to maximize representation and resource distribution in crucial battlegrounds where electoral fortunes remain unpredictable.

PAS, conversely, has leveraged its robust organizational machinery and reliable electoral base to position itself as the indispensable component of Perikatan Nasional. The party's governance record in states like Kelantan and Terengganu has strengthened its claim to administrative competence, a narrative that contrasts with perceptions of Bersatu's instability. This asymmetry has permitted PAS to increasingly assert its preferences without equivalent leverage from Bersatu to enforce compliance or preserve equilibrium within the coalition.

The implications for Perikatan Nasional's sustainability hinge on whether the underlying disputes reflect manageable policy disagreements or fundamental incompatibility in long-term objectives. Evidence suggests the rupture extends beyond tactical disagreements into questions of ideological direction and coalition purpose. PAS has consistently advocated for stronger emphasis on Islamic governance frameworks and religious policy implementation, while Bersatu leadership has historically resisted such positioning, fearing it alienates moderate urban voters and non-Muslim communities in mixed constituencies.

Regional dynamics compound these tensions. In Selangor, both parties harbour ambitions to capture state administration from Pakatan Harapan, yet they disagree on coalition partner selection and power-sharing arrangements should an electoral opportunity arise. These state-level competitions increasingly supersede pan-coalition strategic thinking, with party leaders prioritizing local power consolidation over maintaining broader coalition unity. The outcome risks creating parallel power structures within Perikatan Nasional that undermine coherent national opposition positioning.

For Malaysian voters and the broader political system, persistent coalition instability presents distinct challenges. A fractured opposition weakens legislative scrutiny of the government and reduces voters' choice between credible alternative administrations. It also creates opportunities for opportunistic political realignment, potentially destabilizing government stability if coalition members sense advantage in repositioning. International investors monitoring Malaysia's political trajectory also face uncertainty regarding the durability of whatever governing arrangement emerges from future elections.

Yusri Ibrahim's assessment suggests the conflict has crossed a threshold where standard mediation mechanisms are unlikely to restore genuine partnership. Once political actors resort to "guerrilla" tactics—indirect sabotage, information warfare, and competitive positioning rather than face-to-face negotiation—the trust deficit typically becomes insurmountable. Formal coalition structures may persist through elections, but their operational coherence deteriorates, yielding brittle arrangements vulnerable to sudden fragmentation.

The timeline for resolution remains uncertain. Neither PAS nor Bersatu appears willing to dissolve their coalition participation immediately, as both benefit from opposition status relative to the Anwar government. Yet the absence of reconciliation mechanisms and deepening mutual suspicion suggest Perikatan Nasional faces a prolonged period of internal instability. Whether this culminates in managed separation or explosive disintegration will likely depend on electoral pressures and opportunities for individual party advancement that may or may not materialize before the next general election.