The CIA officer, who has died aged 84, sold secrets to the Soviet Union, leading to the deaths of at least 10 Western agents. In 1994, the BBC spoke to one of the spies he betrayed.
The CSTO's influence is declining as Armenia turns away, while former allies pursue independent partnerships.
Shortly after World War II, as the United States faced a rising Soviet Union, a devastated Europe, and the dawn of a Cold War, President Harry S. Truman got clobbered in midterm elections.
In November 1957, Soviet scientists sent Laika on a one-way voyage, making her a tragic national hero. Sixty years on, one scientist's son told the BBC about playing with her as a boy.
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Afghanistan has been a focus of centuries of war and occupation, from the British Empire to the Soviet Union and the United States. As that legacy complicates the entire region, CNN’s Ivan Watson shares what CNN found by tracking abandoned US military equipment in Pakistan.
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Kim Philby's defection to the Soviet Union was made public on 30 July 1963. In 2016, the BBC broadcast previously unseen footage of a lecture he gave to the Stasi.