negotiate humanitarian corridors. he came here to kyiv on the second leg of that trip. if you were hoping for some sort of major breakthrough between russia and the united nations and humanitarian corridors, this is the message that russia chooses to send while the u.n. secretary general is in town. kate? matt, thank you so much for that. now let s go to the besieged city of mariupol. president zelenskyy s office says an operation to evacuate hundreds of civilians from the steel plant is planned for today. unfortunately as we ve seen so many times before, a top mariupol official says russian troops are blocking part of the complex. a field hospital there is also now destroyed. ukraine says the plant was hit by 50 air strikes in just the last 24 hours. scott mcclain with more on this. what more are you picking up? reporter: hey, kate, yeah, you mentioned that operation the president promised to send to get people out from underneath of that sprawling steel plant. i just finished a