Diplomacy

Diplomacy is an act of contacting other factions' councilors, usually to trade, or to bribe them to improve relationship. Factions have different degrees of relationships with each other:

• Support (only Servants to Aliens)
• Tolerance, non-aggression pact
• Tolerance
• In Conflict
• War

Contact with human factions

To conduct diplomacy, a councilor needs to do Contact mission on an adviser of target faction.

Trade interface

It's possible to trade following things:

• Resources
• Orgs (including assigned orgs)
• Habs
• Engineering projects
• Non-aggression pact

All factions will slowly begin to target the most threatening faction in the game. The most threatening faction is the one that has the highest threat score, calculated with the following formula: control points + (sum of all armies' Miltech * 0.5) + active hab modules + objectives completed. AI will not offer a non-aggression pact to the most threatening faction.

Contact aliens

SPOILERS INSIDE!

Factions that can speak Hydra language may contact alien operatives. This refreshes alien threat level. Other than that, there doesn't seem to be a reason to do this. However, there are lines of alien diplomatic contact dialogue in game files: Servants: Greetings, faithful servant (Kneel, domestic animal). You are loved (you are nothing). Protectorate/War: Yield (die). Protectorate/in conflict: Submission=survival (Resistance=obliteration). Protectorate/Tolerance: You are tolerated (You present no threat). Academy/War: Undesired obstacle (Expunge the threat). Academy/In conflict: Cease. Cease. Cease. (Threat. Threat. Threat.). Academy/Tolerance: Communication=acceptable (Human=persuadable?).