Corporate wars and alliances are entirely superficial and really don’t mean anything, and it’s very hard to tell who’s allied/warred without referring to a list on the corporation if applicable.
I feel like in Open Space, allied corporate members should appear as blue, and enemies of your corporation should appear red, or have a marker by their icon.
In PvP the target enemies could have that “event ship” marker next to their name to indicate your corporation is at war with theirs. That would make identifying targets much easier, and keep friendly fire at a minimum,