>> "the new york times" first reporting today the white house assembled a tiger team of national security officials. they are tasked with playing out scenarios and responses to a possible chemical, biological or nuclear tack from russia. and as the war on ukraine reaches the one-month park, this is mariupol, a once thriving port in ukraine where the devastation can only be described as apocalyptic. in kyiv, air assaults destroyed neighborhoods and dozens of residents, and it has been a war against civilians. and richard engel spoke to those being treated by doctors and nurses in the air raids. >> it's a terrible trauma.