Catechism of the Catholic Church:
2308 All citizens and all governments are obliged to work for the avoidance of war. (2266)
However, “as long as the danger of war persists and there is no international authority with the necessary competence and power, governments cannot be denied the right of lawful self-defense, once all peace efforts have failed.”
.... Best of luck trying to defend yourself from unjust aggression without weaponry.
but is the catechism really relevant to world affairs and nations any more than Sharia law?