A group of Russian hackers has spent the last year targeting nuclear scientists, defense contractors, and government employees in a cyber-espionage campaign, according to private-sector researchers and warnings from spy agencies released Thursday.

A group of Russian hackers has spent the last year targeting nuclear scientists, defense contractors, and government employees in a cyber-espionage campaign, according to…

A group of Russian hackers has spent the last year targeting nuclear scientists, defense contractors, and government employees in a cyber-espionage campaign