Some experts say the U.S. should pay more attention to Chinese government-sponsored hackers.
The discovery of the plot led to a laptop ban on flights from eight majority Middle Eastern nations in March.
Rostec says it logged thousands of suspicious cyber-incidents last year.
Russia's intelligence service doesn't attribute blame for the widespread attack targeting government agencies, defense companies.
Bill Evanina said he had seen "no indication...that anything has changed."
Director of National Intelligence James Clapper said his approach will be to "trust but verify."
A Moscow-based security software maker has exposed a series of Western cyber espionage operations.
A cyber espionage ring attacked more than 100 firms, most of them pharmaceutical and healthcare companies, to get insider information.
Senior analyst warns: "We are not dealing with your average hacker"
Head of NSA warns that we could soon see cyber attacks regularly attacking critical infrastructure
The streams were obtained by hacking personal webcams, CCTV and even baby monitors