The United States, and have all recently expanded their underground test sites, a development that concerns nonproliferation experts who fear a new global arms race.Satellite images shared with DailyMail.com on Friday show significant construction in recent years at the National Security Site near Area 51 in the US, China's Lop Nur test site, and Russia's atomic proving ground Novaya Zemlya.While there is no evidence that a nuclear test is imminent at any of the three sites, experts fear that that the three powers are goading each other closer to the resumption of underground nuclear tests for the first time since 1996.
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