(NYTIMES) - In a recent essay on great power competition and climate change, Mr Rob Litwak, an arms control expert at the Wilson Centre, recalled a question that US president Ronald Reagan posed to Soviet leader Mikhail Gorbachev, after they took a walk during their 1985 Lake Geneva summit.
As Mr Gorbachev put it later: "President Reagan suddenly said to me, 'What would you do if the United States were suddenly attacked by someone from outer space? Would you help us?'
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