Khitomer Accords

The Khitomer Accords were a series of peace treaties signed between the United Federation of Planets and the Klingon Empire that put an end to years of hostility between the two powers. The treaties were signed at Camp Khitomer on the planet Khitomer in 2293. The turning point in Federation-Klingon relations was brought on by the explosion of Praxis, a Klingon energy moon, which directly threatened the habitability of Qo'noS, the Klingon homeworld. At the time of the explosion, it was thought that the Empire only had fifty years of life left. 

The Second Accord banned the use of subspace weapons, a restriction which was openly ignored by the Son'a. 

The Imperial Klingon State was formed in 2295 by Klingons opposed to the Accords.