30 minutes. ♪ ♪ ♪ captioning sponsored by cbs >> diaz: tonight, civilians caught in the crosshairs. bombings intensify across the country, russia accused of violating limited cease fires, renewing attacks on two besieged cities, casualties adding up. >> reporter: i'm chris livesay. >> diaz: ukraine fighting back. new video claims to show the shooting down of a russian helicopter, and a fighter jet. new warning from vladimir putin, saying moves to punish russia are, in his words, like a declaration of war. while the u.s. secretary of state says the world is watching, as he meets with war