The Vatican City State is a neutral nation, which has not engaged in any war since its formation in 1929 by the Lateran Treaty. It has no formal military compact or agreement with neighbouring Italy, although responsibility for defending the Vatican City from an international aggressor is likely to lie primarily with the Italian Armed Forces. Although the Vatican City State has never been at war, its forces were exposed to military aggression when it was bombed during World War II, and whilst defending Vatican property in Rome during the same conflict.