So why does the administration assume that the reverse is true—that China is less willing to cooperate due to U.S. spying? Why does the administration believe that easing our espionage in China will lead to greater Chinese cooperation? None of Obama’s concessions over the past year has encouraged Beijing to cooperate on Iran or climate change. Nor will this concession; indeed, it is likely to have the opposite effect. If anything, it will encourage Beijing to offer the illusion of greater cooperation while seeking additional concessions. And without good intelligence on Beijing, attempts to negotiate with it on these issues will be unproductive.

A better question is "Why are they able to accurately assess how much espionage we're doing?" ...