Seven U.S. allies warned that a Chinese state-sponsored hacking group poses a threat to their networks, in an unusual coordinated move by Western governments to call out a global hacking operation they say is directed by Beijing’s intelligence services. Tuesday’s advisory was a rare instance of Washington’s major allies in the Pacific and elsewhere joining to sound the alarm on China’s cyber activity. Australia led and published the advisory. It was joined by the U.S., U.K., Canada and...