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Our freedom, and this is the reason -- this is the reason we will fight to the end. >> reporter: a u.s. official said today that once an attack begins, knowledge of what's happening will dramatically decrease because america will have no people on the ground and no reconnaissance planes in the air. norah. >> reporter: holly williams in kyiv for us tonight. thank you. white house officials today were on capitol hill briefing congress on the latest intelligence. we want to welcome robert costa joining cbs news as our chief election and campaign correspondent working t the phos on ukraine. robert...