against the nation's third largest city, that is odessa in the south on the black seacoast. >> translator: they are preparing to bomb odessa, russian people always used to come to odessa, and they only knew warmth and generosity, and what's now? arti artillery, bombs against odessa. this will be a war crime. >> cnn international security editor nick paton walsh is in odessa. you have really twin concerns there, you and i have been talking about over recent days. one is the possibility of an amphibious invasion in the south. now this prospect the president warning of a bombing campaign, which we've seen on so many cities. how is the city preparing? >> reporter: well, i don't know if you can still hear the air raid sirens we've heard a couple of times during today. no explosions to accompany them, but it shows you really, i think, how president zelenskyy's warning is being taken to heart hear. certainly that's been the case