U.S. strikes back at Russia in cyberspace warfare

With little public fanfare, U.S. Cyber Command, the military’s new center for combating electronic attacks against the United States, has launched operations to deter and disrupt Russians who have been meddling with the U.S. political system. Like other U.S. cyberwar activities, this effort against Russia is cloaked in secrecy. But it appears to involve, in part, a warning to suspected Russian hackers that echoes a menacing phrase that’s a staple of many fictional crime and spy thrillers: We kn

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