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Air raid sirens could be heard across Kyiv as sources say the U.S. is concerned the Ukrainian capital could fall to Russia within days. Ukrainian President Volodymyr Zelensky gave a message late Friday night warning that "the fate of Ukraine is being decided right now" as Russian forces close in on the country's capital. This as, for the first time, the NATO Response Force has been activated as a defensive measure in response to Russia's ongoing invasion. CNN correspondents reporting from across Ukraine join Erin to give the latest updates on what's happening in cities throughout the country.

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