Less than a day after that announcement and after Xi had met in Seattle with the executives of leading American technology companies, a hacking group accused of having links to the Chinese government attacked one such company, looking for trade secrets.

In a recent blog post, the security services provider CrowdStrike, based in Irvine, Calif., said that it had tracked a number of attacks on American tech and pharmaceutical companies leading up to and after Xi's visit to the United States last month.

“We detected and stopped the actors, so no exfiltration of customer data actually took place,” according to the post, written by the CrowdStrike co-founder and chief technology officer Dmitri Alperovitch.

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