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Story summary
- The United States Department of State accuses China of a 2020 yield-producing nuclear test, challenging the moratorium.
- Officials warn China may prepare additional tests, complicating arms-control discussions.
- Thomas DiNanno, a U.S. arms-control official, says China has masked its nuclear activities.
- The renewed debate argues that simulations may not suffice as rivals conduct live tests.
- A return to explosive testing would represent a significant policy shift for the United States.
