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.
Originated by George Kennan, Dean Acheson, and other diplomats and policy advisors, the policy of containment aimed not to fight an all out war with the communist Soviet Union, but rather to confine communism and the Soviet Union to their existing boundaries. This doctrine led directly to the Vietnam war.