>> reporter: many of them can't get out, it's difficult to get to the western part of ukraine. the journey could take 24 hours. some people don't have the resources or ability to get there. they have to hunker down. it's a city of nearly 3 million. you raise an interesting question for the international community. how many civilian casualties can be accepted until things are escalated? it's a difficult area and balance. the world doesn't want to start world war iii, but they want to pressure the russians into respecting human rights and not killing civilians. that will be the question in the coming days, pumping more weapons an end sanctioning other parts of the russian economy. today, we've heard the secretary of state antony blinken announce these sanctions targeting the russian defense economy sector: 22 entities. i think we will see that pressure ratcheting up on the