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The formal process by which a sending state authorizes a diplomatic agent to act on its behalf in the receiving state. Accreditation begins with the issuance of letters of credence, signed by the head of state, and is completed upon their formal presentation to the host government. The Vienna Convention on Diplomatic Relations (1961) establishes the framework under which accreditation operates, specifying the classes of heads of mission and the precedence among them. A diplomat is considered to have taken up functions upon presenting credentials or upon notifying arrival to the Ministry of Foreign Affairs, depending on the practice of the receiving state.

Historical precedent traces the formalization of accreditation to the Congress of Vienna (1815), which established the modern classification of diplomatic agents into ambassadors, envoys, and charges d'affaires. Prior to this standardization, the reception of foreign emissaries was governed by ad hoc arrangements that often led to disputes over precedence and protocol.

A Latin term denoting an act or situation that provokes or justifies a declaration of war. In classical international law, the concept of casus belli served as a threshold mechanism requiring states to articulate specific grievances before resorting to armed conflict. The doctrine presupposed the legitimacy of war as an instrument of policy, a position that has been fundamentally altered by the United Nations Charter's prohibition on the use of force except in self-defense or with Security Council authorization.

The concept retains analytical utility in modern diplomatic discourse, though its legal significance has diminished. Contemporary scholars employ the term when examining the stated justifications for military interventions, distinguishing between genuine security threats and pretextual claims. The evolution from casus belli to the modern doctrine of "responsibility to protect" illustrates the shifting normative foundations of international conflict.

The deliberate relaxation of tensions between states, particularly associated with the period of improved relations between the United States and the Soviet Union during the 1970s. Detente represents not the resolution of underlying conflicts but rather a mutual recognition that the costs of sustained confrontation outweigh the risks of measured engagement. The policy was characterized by arms control negotiations (SALT I, 1972), increased trade relations, and diplomatic exchanges designed to reduce the probability of direct military conflict.

The concept predates the Cold War. Diplomatic historians trace analogous periods of deliberate tension-reduction to the Concert of Europe following the Napoleonic Wars, when the great powers established mechanisms for consultation and crisis management that prevented general European war for nearly a century. The Helsinki Final Act (1975) represented the high-water mark of Cold War detente, establishing principles of sovereign equality, non-intervention, and respect for human rights that outlasted the policy framework itself.

The legal fiction by which certain persons or premises are deemed to be outside the territorial jurisdiction of the state in which they are physically located. The most familiar application is the inviolability of diplomatic premises: under Article 22 of the Vienna Convention, the premises of a diplomatic mission are inviolable, and agents of the receiving state may not enter them without consent. This principle extends to diplomatic agents themselves, who enjoy immunity from arrest, detention, and the criminal jurisdiction of the receiving state.

Extraterritoriality has a complex history, particularly in the context of the "unequal treaties" imposed upon China, Japan, the Ottoman Empire, and other states during the nineteenth century, which established foreign judicial enclaves exempt from local law. The abolition of these extraterritorial privileges became a central demand of nationalist movements and a prerequisite for the restoration of full sovereignty. Modern international law has refined the concept, distinguishing between functional immunity (attached to the office) and personal immunity (attached to the individual).

A method of peaceful dispute settlement in which a third party offers its services to facilitate communication between disputants without actively participating in the negotiation itself. Good offices differ from mediation in that the third party does not propose terms of settlement but merely creates the conditions under which the parties can engage in direct dialogue. The concept is codified in the Hague Conventions (1899, 1907) and remains a standard instrument in the United Nations repertoire of conflict resolution mechanisms.

The practice reflects a fundamental principle of diplomatic culture: that the mere act of creating a space for communication can alter the dynamics of a dispute. Historical examples include Norway's facilitation of the Oslo Accords backchannel, Switzerland's representation of American interests in Iran, and the Vatican's role in mediating the Beagle Channel dispute between Argentina and Chile. The provider of good offices gains no formal standing in the dispute but often acquires considerable soft-power influence through the exercise of this function.

A declaration by the receiving state that a diplomatic agent is no longer acceptable. Under Article 9 of the Vienna Convention, the receiving state may at any time and without obligation to explain its decision notify the sending state that a member of its diplomatic staff is persona non grata. The sending state must then recall the person or terminate their functions. If it refuses, the receiving state may decline to recognize the person as a member of the mission.

The declaration of persona non grata serves as the primary enforcement mechanism in diplomatic relations, functioning as an expulsion that preserves the fiction of voluntariness essential to diplomatic protocol. Mass expulsions of diplomats have occurred during periods of acute tension, most notably the reciprocal expulsions during the Cold War and the coordinated expulsion of Russian diplomats by Western states following the Skripal poisoning in 2018. The mechanism is deliberately ambiguous, serving simultaneously as a punitive measure and a communicative signal.