Home2015 Treaties and Agreements ...Lithuania (15-618) – Agreement Regarding Defense Cooperation hide Lithuania (15-618) – Agreement Regarding Defense Cooperation TIAS Office of Treaty Affairs June 18, 2015 Defense: Cooperation Agreement effected by exchange of notes at Vilnius June 15 and 18, 2015; entered into force June 18, 2015. Download attachment [624 KB] Tags Defense Lithuania Treaties