The division between the two is often not clear and is often politicized in disagreements within a government over a treaty, since a non-self-executing treaty cannot be acted on without the proper change in domestic law. If a treaty requires implementing legislation, a state may be in default of its obligations by the failure of its legislature to pass the necessary domestic laws.
What type of treaty cannot be acted on without the proper change in domestic law? A state party may be in default of its obligations under a non-self-executing treaty if its legislature fails to do what? What institution of a party to a treaty must act to fulfill the party's obligations under a non-self-executing treaty? The often unclear division between a self-executing treaty and a non-self-executing treaty can lead to a treaty being what if disagreements exist within a party? A treaty may be politicized due to disagreements within a party because the division between a self-executing treaty and a non-self-executing treaty can often be described as what?