Introduction:
This paper examines the interdependence between urban sustainability and the national defence system in Romania within the framework of integrated strategic planning. The study is grounded in the premise that a sustainable city is inherently a secure city, capable of anticipating and managing complex crises. Urban management is conceptualised as a central pillar in coordinating resilience through the integration of security and defence policies into spatial planning instruments, in accordance with the objectives established by the United Nations Agenda 2030 for Sustainable Development.

Methodology:
The research employs a qualitative analysis of the synergy between institutions within Romania’s national defence system and local public administration authorities. It examines the integration of defence components into the urban environment, with particular emphasis on the protection of critical infrastructure and the implementation of the 2021 resilience guidelines issued by the North Atlantic Treaty Organization.

Results:
The findings indicate that Romania’s national defence system has evolved beyond a strictly military role, emerging as a key actor in safeguarding the vital functions of society. A central aspect identified is the need to align General Urban Plans with national defence strategies in order to ensure efficient evacuation routes, emergency shelter infrastructure, and the designation of protective buffer zones. The proposed approach contributes to reducing urban vulnerabilities and strengthening institutional response capacity in times of crisis.

Conclusions:
Although the integration of strategic objectives within urban areas may generate social discomfort or perceptions of militarisation, the research demonstrates that such risks can be mitigated through participatory governance and transparent institutional communication. In conclusion, the national defence system acts as a supporting actor in strengthening community trust and ensuring long-term urban sustainability in Romania.