The Federation-Cardassian armistice was a cease fire agreement during the Federation-Cardassian War signed by both the United Federation of Planets and the Cardassian Union in 2367, ending major engagements and opened diplomatic channels between the two organizations. Captain Edward Jellico helped to negotiate this armistice. However, minor skirmishes on both sides continued despite this, primarily over the unresolved issue of controlled planets along the border, such as Minos Korva, and the ongoing Occupation of Bajor. The Federation-Cardassian Treaty was signed between the two powers three years later. (TNG: "The Wounded", "Chain Of Command, Part I", "Chain Of Command, Part II", "Ensign Ro")
In 2368, Jean-Luc Picard met with Keeve Falor for information regarding Orta. Keeve was disappointed that the Federation had a policy of non-interference with other civilizations, but Picard pointed out this treaty gave the Federation an avenue to work on their behalf. (TNG: "Ensign Ro")
"Dreadnought" described "the treaty of 2367" as establishing a "Cardassian-Federation Alliance".