Would deploying U.S. military operations against Latin American drug cartels in Mexico and Colombia without host-country consent violate international law under the UN Charter (art. 2(4)) and customary international law (Nicaragua v. United States (1986))?

Question

Would deploying U.S. military operations against Latin American drug cartels in Mexico and Colombia without host-country consent violate international law under the UN Charter (art. 2(4)) and customary international law (Nicaragua v. United States (1986))?

Accepted Answer

Under Article 2(4) of the United Nations Charter, “All Members shall refrain… from the threat or use of force against the territorial integrity or political independence of any state” (UN Charter, art. 2(4)) (). The International Court of Justice in Military and Paramilitary Activities in and Against Nicaragua (Nicaragua v. United States (1986)) held that directing military operations over another State’s territory without consent breached customary international law’s prohibition on the use of force and the principle of sovereignty (). No general exception exists for targeting non-State actors; any use of force must be justified by Security Council authorization (UN Charter, ch. VII) or a valid self-defense claim under Article 51, which itself requires an “armed attack” and necessity and proportionality ().

Would deploying U.S. military operations against Latin American drug cartels in Mexico and Colombia without host-country consent violate international law under the UN Charter (art. 2(4)) and customary international law (Nicaragua v. United States (1986))?

Explanation

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