The US Government established in 20o9 its military cyber command in order to defend the country from cyber attacks. A Government spokesman confirmed the US Government is supporting the growth for its cyber command but it is not yet ready to repel any cyber attacks. The Pentagons principal adviser on cyber security Eric Rosenbach explained: Yes, they currently do not have a robust capability North Korea, Russia, China, Danmark are among the countries that are more investing to improve their cyber capabilities, and of course, the governments belonging to the Five Eyes alliance.”]
Source: https://securityaffairs.co/wordpress/36034/cyber-warfare-2/us-cyber-command-abilities.html