Palau ratified the Comprehensive Nuclear-Test-Ban Treaty and the International Telecommunication Constitution and Convention. Palau is also a member State to the International Telecommunication Union, and a subscribing State to the Hague Code of Conduct Against Ballistic Missile Proliferation. Palau cooperates with the United States of America in defense and security through the Compact of Free Association. The state also hosts the Palau Tracking Station which was established in cooperation with the Korea Aerospace Research Institute (KARI).