itch.io

The agents should already show which lands are hostile, when selected. Any agent who is banned (paladins included) will cause all nations who have exiled them to have a red overlay, even in the normal view.

But yes, some kind of international diplomacy view could be useful. It would allow the player to see the international state of affairs at a glance, as there's currently no easy way to spot wars (red lines are very small, and only exist if the nations are neighbours).