Can you declare war on a declared friend in Civ 6?

In Civilization 6, are you allowed to make a declaration of war against someone that you have a formal friendship relationship with?

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3 Answers

Yes, you can declare war on friends. Of course this will be met with diplomatic penalties such as warmongering and denouncing, but nonetheless you can do it.

EDIT: As tubes pointed out, you cannot declare war on Allies.

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I don't think the accepted answer is true anymore. I want to attack a civilization (a declared friend, not an ally) which is attacking an allied city state, but I am unable to declare a surprise war:

Could this have been changed in a later patch?

Whether or not it is possible to declare war using a causus belli I do not know.

• Allies (have Flags icon) - can’t cause war
• Declared friend (have Cyan smiley icon) - can’t cause war
• Friend (have Green smiley icon) - can cause war