How do realists define national interest?

How do realists define national interest?

Realists define national interest as the primary objective of a state, which is to ensure its survival, security, and power in the international system. They believe that states are driven by self-interest and prioritize their own well-being above all else. Realists argue that national interest is determined by factors such as military strength, economic prosperity, territorial integrity, and the pursuit of power and influence. They emphasize the importance of maintaining a balance of power and engaging in strategic calculations to protect and advance their national interests.