could drive another surge in hospitalizations. o donnell: plus the empty streets of shanghai except for robot dogs, the latest lockdown. severe weather outbreaks, the fourth straight week of tornado threats plus the blizzard warning in april. we re tracking the storm. ghost guns crackdown. what president biden is doing to take untraceable guns off the streets. sticker shock. it s no yolk as egg prices surge ahead of easter. imagine all the people. o donnell: and imagine, a son performs his father s song of peace for the people of ukraine. this is the cbs evening news with norah o donnell, reporting tonight from new york. o donnell: good evening to our viewers in the west, and thank you for joining us as we start a new week together. tonight ukrainian officials are warning residents in the eastern part of the country to flee ahead of an expected major assault by tens of thousands of russian troops. the pentagon is seeing an early indication that russian troops are