Process by which one state, at the request of another, returns a person for trial for a crime punishable by the laws of the requesting state and committed outside the state of refuge. Extradition is regulated within countries by extradition acts and between countries by treaties. Some principles of extradition are common to many countries. Most decline to surrender their own nationals. Countries also generally recognize the right of political asylum. In view of the solidarity of nations in the repression of crime, however, countries are usually willing to cooperate in bringing criminals to justice.