What are the motifs in Ghost Wars: The Secret History of the CIA, Afghanistan, and Bin Laden,' by Steve Coll?

A recurring idea of the book can be called ambiguous policy in Afghanistan. When the Soviets are in Afghanistan, the CIA becomes involved in supplying Massoud and others as part of their Cold War strategy. They fear that the Soviets are trying to move into the oil countries of the Middle East. The role of the United States at this time is strictly covert. It is not their war and they cannot commit to it publicly.