A week before US Secretary of State John F. Kerry and two weeks before US President Obama are due to arrive in Beijing for a series of high-level talks, a coalition of security researchers identified a Chinese cyber-espionage group that appears to be the most sophisticated of any publicly known Chinese hacker unit and targets not only U.S. and Western government agencies but also dissidents inside and outside China.The state-sponsored hacker group dubbed 'Axiom' is going after intelligence benefiting Chinese domestic and international policies — an approach that combines commercial cyber-espionage, foreign intelligence and counterintelligence with the monitoring of dissidents. The FBI described Axiom as more sophisticated than Unit 61398, the hacker unit of the People’s Liberation Army.