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government targets. ukraines president volodymyr zelenskyy urging extra caution on this holiday. >> [interpreter] we are sure to retaliate against any former russian tara. but please tomorrow be sure to follow security rules. please respect the curve. you act on the air right sirens. pay attention to official announcements, and remember, we altogether have to get to our victory. >> a lot more from ukraine in just a moment. ♪ ♪ ♪ but first, one of most powerful democrats in the u....

22 minutes past. they are welcome back. twitter is facing accusations of security vulnerabilities, executive cover-ups, and potential foreign spies working as employees. the allegations come from someone who should know, twitters former security cheese. peter zatko is expected to take place in capitol hill hearings this week, but before he speaks to, lawmakers spoke exclusively to cnns joni osullivan. >> why are you coming forward? >> all my life, ive been about finding places i can go and make ...