It is SaO2 that measures oxygen saturation of hemoglobin, and it should be clear that it depends on the partial pressure of arterial oxygen. If PaO2 drops, there's less dissolved oxygen, and therefore less saturation of hemoglobin with oxygen.
The Cuban Missile Crisis was a propaganda victory for the United States and an undisclosed blow to containment. Some may contend that since the Soviet Union ultimately fell, the policy of containment was successful. This is an overly generous statement.
Although the offensive was not militarily successful for the Vietnamese Communists, it was a political and psychological victory for them. It dramatically contradicted optimistic claims by the U.S. government that the war had already been won. See J. J. Wirtz, Tet Offensive (1992).