Christopher Yo
Christopher Yo is the head of the Bureau of Arms Control and Nonproliferation at the U.S. Department of State, where he plays a critical role in overseeing U.S. policies regarding arms control and nuclear nonproliferation. Recently, he has been in the news for commenting on the U.S. claims regarding China's alleged nuclear weapons testing, highlighting concerns about a significant seismic event in 2020 that U.S. officials believe may have been a covert nuclear test conducted by China.
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Russia:
Christopher Yo, the head of the Bureau of Arms Control and Nonproliferation at the U.S. State Department, urged Beijing to admit to conducting tests.
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