A treaty is an express 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 agreement, protocol, covenant, convention or exchange of letters, among other terms...
. Where extradition is compelled by laws, such as among sub-national jurisdictions, the concept may be known more generally as rendition
In law, rendition is a "surrender" or "handing over" of persons or property, particularly from one jurisdiction to another. For criminal suspects, extradition is the most common type of rendition. Rendition can also be seen as the act of handing over, after the request for extradition has taken...
The consensus in international law
Public international law concerns the structure and conduct of sovereign states; analogous entities, such as the Holy See; and intergovernmental organizations. To a lesser degree, international law also may affect multinational corporations and individuals, an impact increasingly evolving beyond...
is that a state
A sovereign state, or simply, state, is a state with a defined territory on which it exercises internal and external sovereignty, a permanent population, a government, and the capacity to enter into relations with other sovereign states. It is also normally understood to be a state which is neither...
does not have any obligation to surrender an alleged criminal to a foreign state as one principle of sovereignty
Sovereignty is the quality of having supreme, independent authority over a geographic area, such as a territory. It can be found in a power to rule and make law that rests on a political fact for which no purely legal explanation can be provided...
is that every state has legal authority over the people within its borders.