The allegations highlight tensions between Washington and Beijing, a day after the expiry of the New Start arms control treaty with Russia.

The United States accused Beijing on Friday of conducting a secret nuclear test in 2020 ‌as it called for a new, broader arms control treaty that would bring in China as well as Russia. The accusations at a global disarmament conference highlighted serious tension between Washington and Beijing at a pivotal moment in nuclear ‍arms control, a day after the treaty limiting US and Russian missile and warhead deployments expired. “I can reveal that the US government is aware that China has conducted…

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