Bajoran-Cardassian Treaty

From Memory Alpha, the free Star Trek reference.

Kai Winn Adami negotiates the Bajor-Cardassia Treaty with Legate Turrel while Benjamin Sisko mediates their discussion in 2371.

The Bajoran-Cardassian Treaty was a historic peace treaty between Bajor and the Cardassian Union signed in 2371. Vedek Bareil was the chief Bajoran negotiator for the treaty, while Legate Turrel represented the Cardassian Union. Although Bareil was injured and close to death, he helped Winn Adami to finish the negotiations. The signing of the Treaty sent shockwaves throughout the Alpha Quadrant. (DS9: "Life Support")

Even with the new Treaty, the Bajorans were still suspicious of the Cardassians and upgraded the orbital sensor array at Prophet's Landing, the closest Bajoran colony to Cardassian space. (DS9: "Heart of Stone")

The Obsidian Order was strongly opposed to it and sent an operative, Dejar to sabotage a combined Federation-Bajoran-Cardassian effort to place a subspace relay station in the Gamma Quadrant. (DS9: "Destiny")

In "Call to Arms", Dukat makes no mention of this treaty, which could mean that the Union seceded from it, upon joining the Dominion.