Chicom cyber attacks against US

 Newsmax:

A top Chinese leader admitted to a Biden administration delegation in a December meeting that it was behind cyberattacks against the United States.

The Wall Street Journal reported on the admission, which left members of the U.S. delegation at the secret meeting in Geneva "startled" after hearing repeated denials of involvement from the Chinese.

The Journal report is based on unnamed sources familiar with the meeting. They indicated the Chinese were apparently warning the U.S. away from continued support of Taiwan.

Dakota Cary, a China specialist at the cybersecurity firm SentinelOne, told the Journal, "A Chinese official would likely only acknowledge the intrusions even in a private setting if instructed to do so by the top levels of Xi's [President Xi Jinping's] government."
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This goes beyond the normal espionage used by hostile powers.  The story does not indicate what countermeasures the US used to deal with the threat.

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And:

 In Secret Meeting, China Acknowledged Role in U.S. Infrastructure Hacks

A senior Chinese official linked intrusions to escalating U.S. support for Taiwan

And:

 China Admits Cyberwarfare Attacks on US Infrastructure Targets - and the Reason Is No Surprise