"I want you to listen carefully," said Chief U.S. Negotiator Max Kampelman with a wide smile, "and I want you to listen with your constructive ear." Victor Karpov, his Soviet counterpart, smiled back, though somewhat less amiably. There was little likelihood of Karpov's attention wandering. He knew that Kampelman was about to unveil a sweeping new American proposal in response to the arms-control plan that the Soviets had tabled with much fanfare five weeks ago.
As the third round of the seven-month-old arms-control talks came to a close last week, Karpov had been preparing for a farewell session with his American...