Truman’s initial response was to order MacArthur to transfer munitions to the ROKA and to use air cover to protect the evacuation of U.S. citizens. Instead of pressing for a congressional declaration of war, which he regarded as too alarmist and time-consuming when time was of the essence, Truman went to the United Nations for sanction. Under U.S. guidance, the UN called for the invasion to halt (June 25), then for the UN member states to provide military assistance to the ROK (June 27). By charter the Security Council considered and passed the resolutions, which could have been vetoed by a permanent member such as the Soviet Union.(britanica, 2022)