2. The main theme of American foreign policy since the time of President Truman has been that if aggression is allowed to stand, the practice would spread until it threatens the general peace; and, therefore, that the world community must enforce the rule even against relatively small violations. How can this sit with America's passivity in the face of Serbian aggression. Is it just that a wider Balkan war does not threaten America's oil supply, as Iraq's invasion of Kuwait did ?