Home2010 Treaties and Agreements ...Greece (10-521) – Agreement Extending the July 8, 1990 Mutual Defense Cooperation Agreement hide Greece (10-521) – Agreement Extending the July 8, 1990 Mutual Defense Cooperation Agreement TIAS Office of Treaty Affairs May 21, 2010 Share Share this page on: Close Defense Agreement effected by exchange of notes at Athens April 14 and May 21, 2010; entered into force May 21, 2010. Agreement Effected by exchange of notes at Athens August 1 and October 11, 2011; entered into force October 11, 2011. Download attachment [330 KB] Tags Defense Greece Treaties