Home2005 Treaties and Agreements ...Sao Tome and Principe (05-819) – Agreement Concerning Defense Cooperation hide Sao Tome and Principe (05-819) – Agreement Concerning Defense Cooperation TIAS Office of Treaty Affairs August 19, 2005 Defense: Cooperation Agreement effected by exchange of notes at Libreville and Sao Tome March 14 and August 19, 2005; entered into force August 19, 2005. Download attachment [372 KB] Tags Defense Sao Tome and Principe Treaties