If the United Nations once admits that international disputes can

Here’s the quote you’re referring to, attributed to Dwight D. Eisenhower, the 34th President of the United States and former Supreme Allied Commander during World War II:

"If the United Nations once admits that international disputes can be settled by using force, then we will have destroyed the foundation of the organization and our best hope of establishing a world order."
— Dwight D. Eisenhower

This statement underscores Eisenhower’s belief in the importance of diplomacy and collective security under the framework of the United Nations. Having witnessed the devastation of global war, Eisenhower warns that resorting to military force undermines the very principles upon which the UN was founded — namely, the peaceful resolution of conflicts and the pursuit of a stable, cooperative international order.