A "peace pact" is a formal agreement or treaty between parties who were in conflict or at war. It's a way for them to resolve their differences and commit to peaceful relations going forward. Full definition
According Palace sources said the Emirs of Kano, Muhammadu Sanusi I and that of Gwandu, Muhammad Bashar, waded into the rift and sealed the final peace pact between the two. (nigeriapoliticsonline.com)
Now scientists have found a notable exception in Central Africa, where lowland gorillas have developed an unusual peace pact. (discovermagazine.com)
Neighboring countries followed suit, entering peace pacts and economic agreements. (dotearth.blogs.nytimes.com)