What is DEFCON? What's nuclear deterrence? What to know amid Putin's warning

What is DEFCON? What's nuclear deterrence? What to know amid Putin's warning https://ift.tt/86nE7yq https://ift.tt/YOwKzjp Yahoo News - Latest News & Headlines February 27, 2022 at 09:02PM https://ift.tt/86nE7yq https://ift.tt/40wLbrD

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