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Alliances are military relationships between two countries promising to aid each other in cases of war. Alliances take up 1 diplomatic relation.
Defensive leagues are purely defensive alliances formed by a city state or minor power. The country forming the defensive league is the leader, which can invite any city state or minor power in their defensive league.
Call to arms
In Imperator you will not be able to refuse a call to arms from an attacked ally. If you want to have the aid of another power you need to be ready to come to their aid.