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FILE - The Chernobyl nuclear plant is seen in an aerial view, showing the damage from an explosion and fire on April 26, 1986, that sent a radioactive plume over Europe. (AP Photo/ Volodymyr Repik, File)

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In a harsh warning, President Vladimir Putin declared that he won't hesitate to use nuclear weapons to protect Russian territory, a threat that comes as Moscow is poised to annex swaths of Ukraine that Moscow has taken over after hastily called referendums there.