The U.S. military needs to improve its ability to deter attacks on its computer networks, and is working to make them more costly for U.S. adversaries, top U.S. military and intelligence officials told a Senate hearing. James Clapper, director of national intelligence, told the committee that cyber threats to the U.S. national and economic security were increasing in frequency, scale, sophistication and severity of impact, both by countries such as Russia, China, Iran and North Korea, as well as non-state actors.
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