And we got the dev diary #23 for Ara, this time about diplomacy. As in Civ, you can propose trade (and research) agreements, declare war (different types though), denounce them, and give gifts to other nations. You get also some more options like connecting your empires via road, or complete narrative events which influence the diplomatic values. As also in Civ, each leader will have a different personality, and will favour different traits of other civs. For more info, just check the video and comment here.