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Install sirens that are tested yearly: what are they for? Protection. Why do we need them? In case of emergency.
What are the sociopaths going to do once a year? Start barking at the sound of sirens each year to assert their dominance? Sound like a lark and way of collecting data about regions.
Plus, every 7 years you can Rickroll your town and claim you have no idea what happened and that someone must have "hacked" the siren system, for additional data.
Optional strategic nuclear bombs placed around your town/city/village so that if negotiations go sour, you can punch your own country in the dick and let your aggressor know that they will be blamed for a well-orchestrated, collateral damage minimized event of self-inflicted injury...
e.g. "What are you going to do? Nuke London Putin? That will be a laugh..."