Sphere of influence

A region where a state claims predominant political or economic influence without formal sovereignty. Such influence can be contested, negotiated, or enforced through economic and military pressure.

Informal empire: A system in which a powerful state controls another country's choices without formally annexing it. A sphere of influence is one way informal empire can organize external control.
Yalta Conference: A February 1945 meeting where Allied leaders discussed the postwar order in Europe and the war against Japan. Its agreements and disputed interpretations shaped rival claims over postwar influence in Europe.
Colony: A territory governed by a foreign power that exercises formal political authority over it. Unlike a sphere of influence, a colony is subject to explicit external rule.
Non-Aligned Movement: A grouping of states that sought independence from the Cold War military blocs. Its members sought to avoid subordination to either superpower's sphere.
Non-intervention: The principle that states should not interfere in the internal affairs of other states. Sphere claims can conflict directly with the norm against external interference.
Unequal treaty: A treaty imposed under conditions that heavily favor one party and restrict the other's sovereignty. Such treaties can formalize a powerful state's privileged access within a weaker state's territory.
Eastern Bloc: The group of European states aligned politically and militarily with the Soviet Union during the Cold War. Soviet predominance over these states became a defining Cold War sphere of influence.
Protectorate: A territory retaining some internal authority while another state controls key external or security affairs. A protectorate establishes a more formal relationship than a sphere's often ambiguous claim.
Proxy war: An armed conflict in which outside powers support local belligerents instead of fighting each other directly. Rival powers have used local conflicts to contest influence without direct war.
Responsibility to protect: An international commitment that states should protect populations from genocide, war crimes, ethnic cleansing, and crimes against humanity. Debates over intervention ask whether protection duties override objections to outside influence.

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