US government created backdoors at Internet Service Providers (ISP) to spy on its citizens. China then hacked these backdoors and used them to spy on the U.S. – WSJ
A cyberattack tied to the Chinese government penetrated the networks of a swath of U.S. broadband providers, potentially accessing information from systems the federal government uses for court-authorized network wiretapping requests. For months or longer, the hackers might have held access to network infrastructure used to cooperate with lawful U.S. …