The 1986 Reykjavik summit between Ronald Reagan and Mikhail Gorbachev marked a turning point in the history of the nuclear-arms race between the two superpowers, with subsequent discussions leading to unprecedented reduc- tions in their nuclear arsenals. The ambitious speech on disarmament that President Barack Obama delivered in Prague on 5 April might be a similar milestone on the way to his stated goal of "a world without nuclear weapons".
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