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US to build new nuclear gravity bomb
(www.defensenews.com)
This is a most excellent place for technology news and articles.
Not disagreeing with you.
China did sign the Nuclear Nonproliferation Treaty (NPT) committing to nuclear nonproliferation and disarmament.
But they're just saying they are not expanding, just modernizing!
https://www.nti.org/analysis/articles/china-nuclear-disarmament/
They are however expected to expand by about double.