there was a russian convoy moving toward kyiv right now. what is u.s. intelligence saying about what's happening on the ground? i'm joined by cnn's katy bow lillis. katy, what are you hearing? >> reporter: all eyes on kyiv, how long can kyiv withstand this russian advance. you know, look, just on friday, sources were telling myself and our colleague jim sciutto that nothing had happened to change the long-standing u.s. intelligence assessment kyiv was only likely to hold out one to four days in the event of a russian full-scale invasion. we are outside of that window at this point. i spoke to a senior western intelligence official over the weekend who said part of that accounts for the fact that the ukrainians know they have to hold kyiv. they don't have a choice. it's the seat of their national government is. that's where their president is. it's the symbol of the identity and existence of the nation that they are trying to save. now, that said, we don't want to