problems, apparent poor troop moral and errors ukrainian troops exploited. the forces have killed a second russian general within days of a general killed last week. u.s. intelligence agencies estimate that up to 4,000 russian soldiers have been killed during the two-week long invasion of ukraine. put that in context for a second. the u.s. had around 2500 military deaths during our 20-year war in afghanistan. here is satellite video showing the long parade of russian armored vehicles, some 40 miles long heading toward ukraine's capital for days it has not been moving. u.s. officials attribute the apparent stall to logistical challenges on the russian side, challenges they believe the russians didn't anticipate. the resistance may continue to surprise but putin's answer to surprise is brutality and according to u.s. intel chiefs, he's likely -- he's unlikely to be detoured. >> we assess putin feels