never again. now, i see that these words are worthless. in europe, a people is being destroyed. >> let's bring in anderson cooper. he's with us again in lviv, western ukraine. so, anderson, tell us about these humanitarian corridors that have been set up to help ukrainians get out of the way of these russian strikes. >> yeah, the ukrainian government says it's established nine corridors, such corridors, for today. the corridors lead out of a number of different cities, including mariupol. a short time ago, city council said 30,000 people have fled the city. as you know, mariupol has been surrounded, just bombarded. the city council says about 80% of mariupol's housing structures are now destroyed. ukrainian officials say that the kr corridors are to allow safe transport out for people who want to leave as well as safe entry for humanitarian aid. i want to bring in nick paton