Ukranian President Volodymyr Zelensky (L) in Riga, Latvia, on October 16, 2019; and US President Joe Biden speaking on June 4, 2021, at the Rehoboth Beach, Delaware.

Video. Kyiv and Washington clarify leaders' nuclear remarks to calm fears

Kyiv says Zelenskyy called for 'pre-emptive sanctions' not a strike against Russia; the White House plays down Biden's warning about Moscow's nuclear threat — and other key developments.

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