Problems caused by the nuclear weapons cause with the Cold War during the early 1960s

What problems did nuclear weapons cause with the Cold War during the early 1960s? Who do you feel was to blame for the Cuban Missile Crisis? Explain your position.

What major challenges erupted in the global community in the 1960s and 70s that caused nations to question both American and Soviet leadership? Of the various crises covered, which did you find to be the most intriguing? Explain your position.