Then Colin Kahl, Vice President Biden’s national security adviser, raised his hand. Kahl wasn’t a specialist on nuclear matters; in Obama’s first term, he’d worked in the Pentagon as the chief civilian official on Middle East affairs, and before then, he’d taught at Georgetown University’s School of Foreign Service. But Kahl thought the generals were missing the big picture. The minute the Russians drop a nuclear bomb, he said, we would face a world-defining moment—the first time an atom bomb had been used since 1945. It would be an opportunity to rally the entire world against Russia. If we
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