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Using diplomatic actions

You must be in diplomatic range to use most diplomatic actions except ending or declaring wars and asking for or canceling military access. The diplomatic range is determined by capital distance, all countries you border are in diplomatic range.

Some diplomatic actions are locked depending on your country rank. For example, only a Major Power can use the Proclaim Guarantee action. If your government type is a republic, the senate will vote on the action, although you can still force it through even if a majority votes against it. This will give you tyranny.

Diplomatic relations cap

A nation, depending on its rank, can have a number of diplomatic relations. Each Alliance and Tributary counts as 1 relation, while a defensive league occupies just 1 slot, no matter how big it is. For each relation over your limit, all your power costs are increased by 10%.

Increasing the diplomatic relations cap

You can increase the number or relations by increasing your size.

Country rank	Extra relations
City State	+1 Diplomatic Relations
Local Power	+2 Diplomatic Relations
Major Power	+3 Diplomatic Relations
Great Power	+4 Diplomatic Relations

Diplomatic actions

War

Declare War / Sue for Peace

Declares war on another nation.

Alliance

Offer/Dissolve Alliance

Creates an alliance between two nations.

Invite/Kick/Leave Defensive League

You need to be a City State or Local Power to use this action.

Influence

Proclaim Guarantee

You need to be a Major Power or greater to use this action. You can protect any nation of lower rank from being attacked, giving you Casus Belli on anyone attacking them.

Intervene in War

You can join on any side in a war, where you have good relation with the war leader. You need to be a Great power to use this action.

Threaten War

You can use a claim, to demand a nation to secede a city or province to you, to avoid an expensive war. You need to be a Major power or Great Power to use this action.

Enforce Peace

You can force a white-peace on a nation in a war, if you have good relations with their enemies. You need to be a great power to use this action.

Relations

Improve Relation

Improves your relations with another nation.

Access

Ask/Cancel Military Access

Lets you move your armies through another nation's territory.

Offer/Cancel Military Access

Lets another nation move through your territory.

参考资料

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