diff --git a/src/warchron/model/campaign.py b/src/warchron/model/campaign.py
index eb55bd3..55bc899 100644
--- a/src/warchron/model/campaign.py
+++ b/src/warchron/model/campaign.py
@@ -107,7 +107,7 @@ class Campaign:
     def remove_campaign_participant(self, participant_id: str) -> None:
         if self.is_over:
             raise ForbiddenOperation("Can't remove participant in a closed campaign.")
-        rounds_blocking: list[Round] = []
+        rounds_blocking: List[Round] = []
         for rnd in self.rounds:
             if rnd.has_choice_with_participant(
                 participant_id
@@ -158,6 +158,10 @@ class Campaign:
     ) -> Sector:
         if self.is_over:
             raise ForbiddenOperation("Can't add sector in a closed campaign.")
+        if round_id is not None:
+            round = self.get_round(round_id)
+            if round.is_over:
+                raise ForbiddenOperation("Can't add sector with a closed round.")
         sect = Sector(
             name, round_id, major_id, minor_id, influence_id, mission, description
         )
@@ -187,11 +191,18 @@ class Campaign:
         mission: str | None,
         description: str | None,
     ) -> None:
-        # TODO raise error if sector used in a closed round (potential tokens)
         if self.is_over:
             raise ForbiddenOperation("Can't update sector in a closed campaign.")
         sect = self.get_sector(sector_id)
         old_round_id = sect.round_id
+        if old_round_id is not None:
+            old_round = self.get_round(old_round_id)
+            if old_round.is_over:
+                raise ForbiddenOperation("Can't update sector used in a closed round.")
+        if round_id is not None:
+            new_round = self.get_round(round_id)
+            if new_round.is_over:
+                raise ForbiddenOperation("Can't update sector with a closed round.")
 
         def apply_update() -> None:
             sect.set_name(name)
@@ -205,7 +216,7 @@ class Campaign:
         if old_round_id == round_id:
             apply_update()
             return
-        affected_rounds: list[Round] = []
+        affected_rounds: List[Round] = []
         for rnd in self.rounds:
             if rnd.id == old_round_id and (
                 rnd.has_choice_with_sector(sector_id)
@@ -235,7 +246,14 @@ class Campaign:
     def remove_sector(self, sector_id: str) -> None:
         if self.is_over:
             raise ForbiddenOperation("Can't remove sector in a closed campaign.")
-        rounds_blocking: list[Round] = []
+        sect = self.get_sector(sector_id)
+        round_id = sect.round_id
+        if round_id is not None:
+            round = self.get_round(round_id)
+            if round.is_over:
+                raise ForbiddenOperation("Can't remove sector used in a closed round.")
+
+        rounds_blocking: List[Round] = []
         for rnd in self.rounds:
             if rnd.has_battle_with_sector(sector_id) or rnd.has_choice_with_sector(
                 sector_id