WaPo reports here:
Chinese government hackers have compromised the computers of a Navy contractor, stealing massive amounts of highly sensitive data related to undersea warfare — including secret plans to develop a supersonic anti-ship missile for use on U.S. submarines by 2020, according to American officials. ...
In September 2015, in a bid to avert economic sanctions, Chinese President Xi Jinping pledged to President Barack Obama that China would refrain from conducting commercial cyberespionage against the United States. Following the pact, China appeared to have curtailed much, although not all, of its hacking activity against U.S. firms, including by the People’s Liberation Army. Both China and the United States consider spying on military technology to fall outside the pact.
