Russian President Vladimir Putin would only consider nuclear weapons in the event he feels an "existential threat" to his country or regime, according to foreign policy experts. Ukraine’s southern port city of Mariupol has been razed to the ground as Russian forces make "desperate" attempts to finish taking the city "at any cost." On Friday, a senior U.S. defense official confirmed that the Russian cruiser had been struck by two Neptune anti-ship missiles fired by the Ukrainians from land-based launchers.

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