Invading city-state border will damage relationship.

core/src/com/unciv/logic/automation/NextTurnAutomation.kt

@@ -1,14 +1,12 @@
 package com.unciv.logic.automation
 
-import com.unciv.logic.civilization.CivilizationInfo
-import com.unciv.logic.civilization.PlayerType
-import com.unciv.logic.civilization.TradeRequest
 import com.unciv.logic.civilization.diplomacy.DiplomacyFlags
 import com.unciv.logic.civilization.diplomacy.DiplomaticStatus
 import com.unciv.logic.civilization.diplomacy.RelationshipLevel
 import com.unciv.logic.map.MapUnit
 import com.unciv.logic.trade.*
 import com.unciv.Constants
+import com.unciv.logic.civilization.*
 import com.unciv.models.gamebasics.GameBasics
 import com.unciv.models.gamebasics.tech.Technology
 import com.unciv.models.gamebasics.tr
@@ -24,6 +22,7 @@ class NextTurnAutomation{
 
         chooseTechToResearch(civInfo)
         adoptPolicy(civInfo)
+        updateDiplomaticRelationship(civInfo)
         declareWar(civInfo)
         automateCityBombardment(civInfo)
         buyBuildingOrUnit(civInfo)
@@ -243,6 +242,36 @@ class NextTurnAutomation{
         }
     }
 
+    private fun updateDiplomaticRelationship(civInfo: CivilizationInfo) {
+        // Check if city-state invaded by other civs
+        if (civInfo.isCityState()) {
+            var militaryUnitsInBorder = HashMap<String, Int>()
+            for (city in civInfo.cities) {
+                for (tile in city.getTiles()) {
+                    val troop = tile.militaryUnit
+                    if (troop != null && troop.owner != civInfo.civName) {
+                        if (militaryUnitsInBorder.containsKey(troop.owner)) {
+                            militaryUnitsInBorder[troop.owner] = militaryUnitsInBorder[troop.owner]!! + 1
+                        } else {
+                            militaryUnitsInBorder[troop.owner] = 1
+                        }
+                    }
+                }
+            }
+
+            for (otherCivName in militaryUnitsInBorder.filter { it.value > 0 }.keys) {
+                val otherCiv = civInfo.gameInfo.getCivilization(otherCivName)
+                if (!otherCiv.isBarbarianCivilization()) {
+                    val diplo = civInfo.getDiplomacyManager(otherCiv)
+                    if (diplo.diplomaticStatus != DiplomaticStatus.War) {
+                        diplo.influence -= 10f
+                        otherCiv.popupAlerts.add(PopupAlert(AlertType.BorderConflict,civInfo.civName))
+                    }
+                }
+            }
+        }
+    }
+
     private fun declareWar(civInfo: CivilizationInfo) {
         if (civInfo.isCityState()) return
         if (civInfo.cities.isNotEmpty() && civInfo.diplomacy.isNotEmpty()) {

core/src/com/unciv/logic/civilization/PopupAlert.kt

@@ -4,7 +4,8 @@ enum class AlertType{
     WarDeclaration,
     Defeated,
     FirstContact,
-    CityConquered
+    CityConquered,
+    BorderConflict
 }
 
 class PopupAlert {

core/src/com/unciv/logic/civilization/diplomacy/DiplomacyManager.kt

@@ -240,9 +240,6 @@ class DiplomacyManager() {
                 thirdCiv.getDiplomacyManager(civInfo).addModifier(DiplomaticModifiers.WarMongerer,5f)
             else thirdCiv.getDiplomacyManager(civInfo).addModifier(DiplomaticModifiers.WarMongerer,-5f)
         }
-
-        //Damage diplomatic relationship
-        otherCivDiplomacy.influence = -50f
     }
 
     fun makePeace(){

core/src/com/unciv/ui/worldscreen/AlertPopup.kt

@@ -63,6 +63,15 @@ class AlertPopup(val worldScreen: WorldScreen, val popupAlert: PopupAlert): Popu
                     close()
                 })
             }
+            AlertType.BorderConflict -> {
+                val translatedNation = worldScreen.gameInfo.getCivilization(popupAlert.value).getTranslatedNation()
+                addLeaderName(translatedNation)
+                addGoodSizedLabel("Remove your troops in our border immediately!").row()
+                val responseTable = Table()
+                responseTable.add(getCloseButton("Sorry."))
+                responseTable.add(getCloseButton("Never!"))
+                add(responseTable)
+            }
         }
         open()
         isOpen = true