Home2018 Treaties and Agreements ...Japan (18-727) – Agreement Concerning a Program for Cooperative Defense Research hide Japan (18-727) – Agreement Concerning a Program for Cooperative Defense Research TIAS Office of Treaty Affairs July 27, 2018 Defense: Cooperation Agreement effected by exchange of notes at Tokyo July 27, 2018; entered into force July 27, 2018. Download attachment [3 MB] Tags Defense Japan Treaties