North Korea’s military strategy has long been characterized by a “blitzkrieg strategy” aimed at the “communization of the Korean Peninsula.” However, with the deterioration of North Korea’s security environment after the Cold War, there have been assessments suggesting a shift towards a strategy focused on deterrence and defense for regime survival. Recently, there have been analyses indicating that North Korea is reinforcing its offensive strategy, bolstered by its nuclear capabilities. Despite these varied interpretations, the dominant view remains that North Korea’s military strategy is inherently aggressive. To explain this phenomenon, this paper poses two key questions and analyzes North Korea’s military strategy from the perspective of regime security; “Has North Korea’s military strategy undergone a clear shift towards either offensive or defensive characteristics?” and “Why has the offensive aspect been excessively emphasized?” The study finds that rather than pursuing a drastic shift in response to changes in the strategic environment, the North Korean regime has consistently balanced offensive and defensive elements. Nevertheless, it confirms that North Korea has developed an aggressive military posture, not merely for territorial expansion, but to protect the regime, strengthen internal cohesion, and deter external threats, often displaying excessive aggressiveness and belligerence. This study demonstrates that regime security is a useful analytical concept for understanding the aggressiveness of North Korea’s military strategy. Moreover, the findings contribute to a better understanding of the nature of the North Korean regime and provide crucial implications for the formulation of military strategies to prepare for potential conflicts arising from various factors.