Hostile missile -- or did you mean CIWS is firing on missiles from neutral powers?
I know what you mean, but I cannot help but think the following...
Tactical Officer: "Captain! Incoming missile barrage!"
Captain: "What?! We are in neutral space! Did the Caldonians declare war?"
Tactical Officer: "Sir? They shot several hundred missiles at us!"
Captain: "Did... they... declare... war?"
Tactical Officer: "Err... No, sir."
Captain: "Tis fineeeeee then!"