Russia’s withdrawal from Kherson leaves top U.S. officials cautiously optimistic

Read MoreTop U.S. officials are cautiously optimistic about Russia’s withdrawal from the vital southern Ukrainian port city of Kherson that’s a gateway to Crimea. CBS News correspondent Chris Livesay reports.Top U.S. officials are cautiously optimistic about Russia’s withdrawal from the vital southern Ukrainian port city of Kherson that’s a gateway to Crimea. CBS News correspondent Chris Livesay reports.