I think mines around a border is logical. If the borders are not your own then it is problematic though. You don't want them scattered on farms like potatoes either. Just to keep out illegal invaders. You tell your citizens to stay safe and away from the mines. I don't want anyone to die so don't step on them. Fences with barbed wire too and electrically charged. You only need it in extreme siuations though. Here it is needed and I don't have an issue with it. Once there is peace then you can cool it a little, but make sure crossing is all legal and honest. Greece and Italy likely need some mines and fences.