China says it’s hard to resume cyber security talks with U.S.

Cyber security is an irritant to bilateral ties. On Wednesday the U.S. Federal Bureau of Investigation said hackers it believed were backed by the Chinese government had launched more attacks on U.S. companies, a charge China rejected as unfounded.

In May, the United States charged five Chinese military officers with hacking American firms, prompting China to shut down a bilateral working group on cyber security.