Who was Oleg Penkovsky and how did his information assist the United States during the Cuban missile crisis?

Oleg Penkovsky was a senior Soviet military intelligence officer who served as a high-level double agent for the United Kingdom and the United States during the Cold War. A colonel in the GRU, he became disillusioned with the Soviet leadership and provided Western intelligence with over 5,000 photographs of classified military, political, and economic documents between 1961 and 1962.1

His contributions were instrumental to the United States during the Cuban missile crisis of October 1962. Specifically, the information he provided regarding the Soviet Union's relatively weak capability in long-range missiles proved invaluable to President John F. Kennedy and his administration in determining U.S. strategy. By revealing the limitations of Soviet nuclear forces, Penkovsky’s intelligence helped the United States navigate the crisis with a clearer understanding of the actual military balance of power. He was arrested by the Soviets on October 22, 1962, at the height of the crisis, and was later executed for treason.12