the cooperation never really stopped. The public backlash over Snowden often obscured a more complicated reality for Germany and other aggrieved U.S. allies. They may be dismayed by the omnivorous nature of the intelligence apparatus the United States has built since the Sept. 11, 2001, attacks, but they are also deeply dependent on it.

Over the past year, Germany has secretly provided detailed information to U.S. spy services on hundreds of German citizens and legal residents suspected of having joined insurgent groups in Syria and Iraq, U.S. and German officials said.