Diplomatic actions

Diplomatic actions both affect diplomatic relations and leverage them for strategic and tactical benefits. See diplomatic modifiers for how each action affects relations.

List of Actions

The player civilization can perform several diplomatic actions:

• Negotiate trades and treaties (see below)
• Declare war
• Offer friendship
• Request that foreign ships leave domestic territory
• Demand tribute
• Offer tribute

Treaties

Treaties are formalized commitments that have a persistent impact on relations with the other civilization.

Type	Effect	Min relations	Turns since meeting	Technology
Peace	End the war with the other civilization.
Alliance	Create an alliance between your two civilizations, vowing to support the ally's side in any war.	9		Unrecognized icon name Interstellar Alliances
Embargo third-party	Embargo a third party's civilization, refusing the establishment of trade routes and severing existing routes.			Unrecognized icon name Diplomacy
Declare war on another civilization	Declare war on a third party civilization.
Open borders	Allow each other's ships to pass through their respective territories without diplomatic penalty.	-3	1	Unrecognized icon name Universal Translator
Exploration	Share each other's sight in the fog of war.	2	20	Unrecognized icon name Universal Translator
Non-aggression pact	Both parties agree not to declare war on each other.	4		Unrecognized icon name Diplomacy
Cultural	Give +25% Unrecognized icon name Influence Growth to the both civilizations through the sharing of culture.	3	20	Cultural Treaty (removed by )
Free trade	Give +25% Unrecognized icon name Gross Income to both civilizations through the sharing of markets.	3	20	Economic Treaty (removed by )
Research	Give +25% Unrecognized icon name Research to the both civilizations through the sharing of knowledge.	4		Research Treaty (removed by )
Military alliance	Special alliance that provides +25% Unrecognized icon name Ship Construction to both civilizations.	6	20	Military Alliance (removed by )
Research alliance	Special alliance that provides +25% Unrecognized icon name Research to both civilizations.	6	20	Research Alliance (removed by )
Culture alliance	Special alliance that provides +25% Unrecognized icon name Influence Growth to both civilizations.	6	20	Culture Alliance (removed by )