Ukrainian President Volodymyr Zelenskyy said Russia's threat of nuclear weapons use "could be a reality," in an interview with CBS' "Face the Nation" Sunday. Zelenskyy said Russia is targeting nuclear power plants in Ukraine, so there could be some truth to Putin's claims. I don't think he's bluffing," Zelenskyy said. U.S. National Security Advisor Jake Sullivan made clear that the United States is taking Putin's nuclear threat seriously. Zelenskyy said Russia is using the war as an excuse to claim that it is being attacked by the West.

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