““Russia and China are aggressive and successful purveyors of economic espionage against the United States,” Director of National Intelligence James Clapper noted in his prepared testimony (.pdf) to the Senate Select Committee on Intelligence. “Iran’s intelligence operations against the United States, including cyber capabilities, have dramatically increased in recent years in depth and complexity. We assess that FIS [Foreign Intelligence Services] from these three countries will remain the top threats to the United States in the coming years.””
(Source: Iran Now a ‘Top Threat’ to U.S. Networks, Spy Chief Claims | Danger Room | Wired.com.)