para bellum
Platinum Member
Article 51.Go read the UN charter the US ratified in 1945.
It is illegal to engage in the use of force and to supply weapons to those who are engaged in an armed conflict.
"Nothing in the present Charter shall impair the inherent right of individual or collective self-defence if an armed attack occurs against a Member of the United Nations, until the Security Council has taken measures necessary to maintain international peace and security."