Defence Dependencies is the reliance on external military capabilities or partnerships to ensure national security. This concept is pivotal in international relations, as states often depend on alliances and defence agreements to bolster their security frameworks. By leveraging military collaborations, nations can enhance their defence posture without solely relying on domestic capabilities. This reliance can manifest in various forms, such as joint military exercises, shared intelligence, and mutual defence treaties. Understanding Defence Dependencies is crucial for analysing global security dynamics and the strategic choices nations make in the face of evolving threats.

Defence Dependencies matter because they shape the strategic landscape of international relations. Nations use these dependencies to deter aggression, balance power, and maintain regional stability. By relying on external military support, countries can address capability gaps and enhance their defence strategies. This reliance also influences diplomatic relations, as states must navigate complex alliances and partnerships. Understanding these dependencies is essential for policymakers to craft effective security policies and respond to global challenges.

Scholars of international relations argue that Defence Dependencies are integral to understanding power dynamics and alliance behaviour. Academic consensus suggests that these dependencies can both stabilise and destabilise regions, depending on how they are managed. For instance, reliance on a powerful ally may deter aggression but can also lead to over-dependence, limiting a nation's autonomy. Analysing Defence Dependencies provides insights into how states negotiate their security needs within a multipolar world, where emerging powers and the Global South play increasingly significant roles.