Casus Belli

Casus belli is a Latin term meaning "reason for war." It refers to the justification or cause a nation presents to justify entering into armed conflict. In international relations, countries often specify a casus belli to explain their engagement in war, such as defending themselves against an attack, protecting allies, or responding to threats. While some casus belli are seen as legitimate reasons, others can be viewed as excuses or pretexts for aggression. Overall, it serves as a formal rationale used to legitimize military action in the context of diplomacy and international law.