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The US claims China secretly conducted nuclear tests, heightening tensions as the New START treaty expires and new arms control discussions begin.
Putin instructs Russian officials to prepare for nuclear tests if the U.S. resumes its own, following Trump's announcement of possible nuclear testing.
Trump's controversial nuclear testing announcement raises questions but reassurances indicate no explosive tests will occur.
Trump's directive to resume nuclear testing raises global concerns about escalating arms races with China and Russia.
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