Russia, China are greatest cyberthreats, but Iran is growing

WASHINGTON (AP) — Russia and China present the greatest cyber security threat to the U.S., but Iran is trying to increase and spend more on its capabilities, the Navy admiral in charge of the military's Cyber Command told Congress Tuesday.

Michael Rogers told the Senate Armed Services Committee that while the U.S. has more overall military power than the three countries, the gaps are narrower when it comes to cyber warfare.

[...] he said that there are increasing worries that extremist groups and others may begin to view cyber as a weapons system and "want to use it as a vehicle to inflict pain against the United States and others."