I remember I visited Italy on a Latin class trip back in high school, and got a real culture shock when I saw carabinieri(?) patrolling the airport armed with some kind of assault rifles or SMGs. I don't remember seeing any "normal" police once I was out walking around in the cities so I have no idea if they would've been armed or not, but that was definitely heavier weaponry than I'd seen any American cop carrying, in the airport or otherwise.