Under guidelines approved recently by President Barack Obama, the U.S. military is authorized to probe the communications networks of sovereign nations, map out strategies for cyberwars and pursue cyber-attackers across national boundaries. The announcement of the rules -- outlined by executive order -- is the culmination of two years of work by the Pentagon to clarify cyberwar protocol, and follows the release on Monday of a Government Accountability Office report that questions the readiness of the Defense Department's Cyber Command.

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