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The first two pages of the Treaty of Brest-Litovsk, in (left to right) German, Hungarian, Bulgarian, Ottoman Turkish and Russian

A treaty is an agreement under international law entered into by actors in international law, namely sovereign states and international organizations. A treaty may also be known as an (international) agreement, protocol, covenant, convention, pact, or exchange of letters, among other terms. Regardless of terminology, all of these forms of agreements are, under international law, equally considered treaties and the rules are the same.<ref>In United States constitutional law, the term "treaty" has a special meaning which is more restricted than its meaning in international law; see United States law below.</ref>

Treaties can be loosely compared to contracts: both are means of willing parties assuming obligations among themselves, and a party to either that fails to live up to their obligations can be held liable under international law.

Treaty sections
Intro  Modern usage  Modern form  Bilateral and multilateral treaties  Adding and amending treaty obligations   Execution and implementation   Ending treaty obligations  Invalid treaties  Role of the United Nations  Relation between national law and treaties by country  Treaties and indigenous peoples  See also  Notes  References  External links  

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