Foreign relations Politics and government International cooperation Arms control Arms transfers Nuclear nonproliferation Political aspects Relations Bougainville Crisis, Papua New Guinea, 1988- Civil service Civil war Congresses Defences Defenses Description and travel Drone aircraft Economic conditions Economic policy Ethnic conflict Extrajudicial executions Human rights Identity politics Intervention (International law) Military relations Moral and ethical aspects Nuclear disarmament Nuclear-weapon-free zones Officials and employees Social policy Targeted killing (International law)