Final answer:
Neo-realists (structural realists) see a primary similarity between international relations and the prisoner's dilemma, as both involve a conflict where the gains from cooperation are larger than the rewards from pursuing self-interest.
Step-by-step explanation:
Neo-realists, also known as structural realists, see a primary similarity between international relations and the prisoner's dilemma. They believe that both situations involve a conflict where the gains from cooperation are larger than the rewards from pursuing self-interest. In international relations, states face a similar dilemma as they can either cooperate with other states to achieve common goals or act in their own self-interest, which can lead to negative outcomes for all parties involved.