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.
After the crisis neither side had such missiles. Thus the USSR had lost nothing whereas the US had lost its missiles in Turkey. Further examples of why the policy of containment failed in Cuba, is because after the crisis USSR was still allied with Cuba and Cuba remained communism.