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Newly unbound, Trump weighs more nuclear arms and underground tests

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A shaft at the Nevada test site being prepared for an underground nuclear test in the early 1990s.

A shaft at the Nevada test site being prepared for an underground nuclear test in the early 1990s.

PHOTO: NATIONAL NUCLEAR SECURITY ADMINISTRATION/NYTIMES

David E. Sanger, William J. Broad

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WASHINGTON – In the five days since the last remaining nuclear treaty between the United States and Russia expired, statements by administration officials have made two things clear: Washington is actively weighing the deployment of more nuclear weapons, and it is also likely to conduct a nuclear test of some kind.

Both steps would reverse nearly 40 years of stricter nuclear control by the United States, which has reduced or kept steady the number of weapons it has loaded into silos, bombers and submarines.

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