I want to know the answer to the following question:
What institution of a party to a treaty must act to fulfill the party's obligations under a non-self-executing treaty?
All the background I'm provided with is that "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.". Is that enough to answer the question?