Final answer:
International anarchy is the absence of a central authority in the international system, leading to self-interested actions by states. The security dilemma stems from this anarchy, as states' defensive measures can threaten others, escalating tensions.
Step-by-step explanation:
International anarchy refers to the lack of overarching authority in the international system, which results in a state of disorder where each sovereign state pursues its own interests. The security dilemma relates to this as it occurs when a state's actions to ensure its own security are perceived as threats by other states, leading to a cycle of mutual distrust and potential escalation of tensions. Together, they create a dynamic where the pursuit of national security can inadvertently undermine overall stability.