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 trying to resupply after pulling out of the north. new video shows a convoy of reinforcements heading toward the donbas region from inside russia. as a reminder that women and children bear its brunt of war, we learn today that nearly two thirds of ukraine's kids have been displaced and the situation is only getting worse. in the besieged port city of mariupol, residents have gone weeks without running water, electricity, food and medical supplies. we have a lot of news to get to tonight and cbs's nancy cordes will start us off from the white house. good evening, nancy. >> reporter: good evening, norah. there are several troubling new signs that russia is marshaling its forces for an all-out assault on eastern ukraine. even austria's chancellor who managed to sit down today with russian president putin came away saying he is pessimistic about what comes next. in eastern ukraine it is a race against time to dig trenches and evacuate civilians as the russian war machine pivots. shelling intensified in the east overnight, as new satellite images showed an eight mile convoy of russian trucks and armored vehicles moving through the east toward the donbas region, home to a large population of russian-backed separatists. >> we believe these are the early stages of a reinforcement efforts by the russians in the donbas. >> reporter: the latest evidence of a shift in strategy after russian forces failed to take the capitol city of kyiv. ukrainian president volodymyr zelenskyy pleaded with south korea's parliament today to give him weapons he can use to fend off the russians in donbas and in southern ukraine. where the mayor of the port city of mariupol today estimated that as many as 20,000 residents have been killed in the ongoing siege. and the horror there isn't over, with the russian military releasing video of missiles being fired from ships in the black sea. on "60 minutes," scott pelley met president zelenskyy in the darkened hallways of his command center and asked about a possible end-game. >> are you willing to give up any part of ukraine for peace? >> ( translated ): overall we're not ready to give away our country. i think we've already given up a lot of lives, so we need to stand firm for as long as we can. but this is life, different things happen. >> it's negotiable? >> ( translated ): well, this issue would definitely be raised in the course of negotiations. >> reporter: but right now the russians aren't negotiating, they're digging in. tapping a new commander to turn the invasion around. he's a veteran of the russian offensive in syria where his tendency to target civilian facilities like hospitals earned him the nickname the butcher of syria. >> the situation in ukraine is very worrying. >> reporter: india's prime minister narendra modi met virtually with president biden, both of them condemning the killing of innocent ukrainians. >> including the tragic shelling in the train station that killed dozens of innocent children and women and civilians attempting to flee the violence. >> reporter: and the death toll from that train station attack stands at 57 with the russian story about it changing. initially russia's defense ministry said it bombed the train station because weapons were being hidden there. but once faced with evidence of clear civilian casualties the defense ministry now says it had nothing to do with it at all. norah. >> o'donnell: nancy cordes at the white house, thank you. the atrocities in ukraine have shocked the world as more alleged war crimes are revealed every day, meanwhile many women in ukraine are living under constant threat and there is growing evidence of sexual violence. cbs' holly williams spoke to a elderly woman who described her experience. >> reporter: vera is 83 years old, a retired school teacher who told us when her village was occupied by russian forces last month she was raped. he grabbed me by the back of the neck, she said. i started to choke, i couldn't breathe. i told the one who raped me i'm old enough t be your mother. would you let this happen to your mother, vera told us. he made me shut up. she said her disabled husband was in the house when she was attacked. and she was also beaten. when he finished he grabbed a bottle of vodka, she told us. i asked if i could put my clothes back on. he barked no. she said when he left he fired his assault rifle in the air three times outside. three times outside. the ukr the ukrainian military said they heard reports of sexual assault by russian forces, we were told others were also raped there including a 16 year old girl. we cannot independently verify any of the allegations, but vera's story with details compelling and heartbreaking. she's also reported it to the ukrainian police, she told us. they took sheets away for testing. i wish he had killed me instead of what he did, vera said. she told us she believes her attacker was from ukraine's far east, a region controlled by russian backed separatists, where men have reportedly been conscripted to fight for russia. everything hurts vera told us. i am in a state where i'm neither dead nor alive. before i felt joy with the spring. now i don't feel anything. i have nothing. >> o'donnell: holly williams joins us now from central ukraine. it is sickening to hear what happened to vera. how are the ukrainians collecting evidence of war crimes? >> reporter: well, norah, we know that ukrainian war crimes investigators have been visiting towns and villages that were occupied by russian forces and documenting dead bodies and alleged atrocities and there have reportedly been multiple allegations of rape, but war crimes are notoriously difficult to prosecute. >> o'donnell: holly williams, thank you for your reporting. back here at home, the fight against the pandemic is far from over. new cases of covid-19 are once again on the rise now that the omicron subvariant ba-2 is the dominant strain. we get more now from meg oliver. >> reporter: trying to beat back a new covid surge, philadelphia announced it will bring back indoor mask requirements effective a week from today. >> i wish the pandemic was over just as much as any of you. but i am very worried about our vulnerable neighbors and loved ones. >> reporter: spring has sprung with the bounce of ba-2, now accounting for more than 72 percent of new covid cases, up nearly 10 percent from a week ago. for now hospitalizations and deaths are on the decline. >> i am concerned that ba-2 could drive another surge in hospitalizations in parts of the country where vaccination rates are still low, especially among the elderly. >> reporter: just 70 percent of the eligible population is fully vaccinated. the top health officials encourage boosters. a preliminary cdc report finds effectiveness is about 60% after three months. >> the question now has come up in the last couple of weeks, what about that second booster. very good evidence from israel that people over 60 should get a booster. i think that part is pretty clear. >> reporter: especially since some studies say ba-2 is more contagious than omicron, with people like new york city mayor eric adams already isolating after testing positive for coronavirus, some health experts say now is the time to act. starting today, students at columbia university in new york city were required to start wearing masks again in class. despite rising cases of ba-2 here in new york city, a new cbs news poll shows covid doesn't even rank among the top five most pressing issues for americans. they're more concerned about the economy and inflation. norah. >> o'donnell: meg oliver, thanks. well china's largest city remains under a strict covid lockdown tonight affecting more than 26 million residents with most being forced to remain indoors. here's cbs's elizabeth palmer. >> reporter: no one dreamed they would ever see this. shanghai, china's cosmopolitan dynamo, empty and silent. at night between the high-rises a drone tells people to follow covid rules and bizarrely not to sing on their balcony. during the day, there is a frantic push by the government to get food to millions shut into their homes. but it hasn't and social media shows protests. in this one the crowd shuts we're starving. while last week a man was filmed venting his fury on the phone. what am i supposed to buy, what do i eat, you are driving us to our death. construction crews have converted shanghai's convention center into a vast isolation ward for 50,000 beds. anyone who tests positive has no choice. as one patient posted on tiktok, i had to board this special bus and then check in to a facility filled with bunks and staff in hazmat suits, there has been economic fallout from this gigantic lockdown too. trucks aren't moving. and the volume of goods leaving shanghai by ship is down more than 25% in a month. that's going to push up prices everywhere, including in the u.s. and add to the pressure on the world's already fraying supply lines. norah. >> o'donnell: elizabeth palmer, thank you. well, with easter less than a week away you may have noticed that the price of eggs has been skyrocketing. costs are being driven up by several factors, including an outbreak of bird flu that has forced farmers to kill more than 20 million chickens. we get more on this from cbs's omar villafranca. >> reporter: sam miller has more than 8,000 hungry mouths to feed every day at cedar ridge egg farm in northeast, texas. the rising cost of the corn and wheat feed is forcing mill tore raise his egg prices. his feed bill for his growing business is up nearly 7,000 dollars a month. >> i don't-- i don't make a lot off my eggs. >> reporter: the war in ukraine, a major grain producer and draught conditions in the u.s. have pushed wheat and corn prices up significantly. that has driven up the price of eggs by 56 percent. last year the national average for a dozen large white eggs was $1.60. now it is up to $2.50. >> your morning breakfast price is going up all the way from the eggs but to the bacon and the toast and everything else. >> reporter: livestock economist david anderson said the worst avian flu outbreak in seven years has killed more than 20 million birds in 24 states and has chipped away at the egg supply and pushed prices up. >> it takes time to adjust to higher prices and higher costs. you don't just snap your fingers and get more production. >> reporter: higher fuel prices are also hammering miller. the cost to fill up his delivery truck almost doubled and he's doing everything he can to avoid raising his egg prices again. >> i had to do something or i'm not going to be here. >> reporter: higher grain prices aren't just affecting eggs. the price per pound of bacon, ground beef, whole chickens are all up compared to last year and experts say those prices will get even higher. norah. >> o'donnell: interesting reporting, omar villafranca, thank you so much. well president biden today announced a crackdown on unlicensed kits to make so called ghost guns, that can be quickly assembled at home or with a 3-d printer, with no serial numbers. making them difficult to trace. the biden administration will require they be classified the same as other guns made and sold in the u.s. ghost guns have been used in a growing number of high profile crimes including the fatal shooting in new york city just last week of a 16 year old girl on her way home from school. the president today also introduced former u.s. attorney steve dettelbach as his nominee to lead the a.t.f. let's turn now to the weather with a spring storm bringing historic snow fall for april in portland, oregon, and blizzard warnings in the dakotas. that same system is expected to trigger severe thunderstorms and possible tornadoes in the plains and the south. so let's get the forecast from mike bettes and the weather channel. good evening, mike. >> good evening, norah. yes, anticipated multi-day severe weather outbreak across the midwest and south as you see behind us, what little rock could look like later on in the evening. more intense storms across the south from arkansas to the ohio river valley here. place like little rock and memphis through the evening and overnight, those storms weaken overnight but guess what, like clock work they return again tomorrow. more storms from texas all the way up into iowa, where thunderstorms and tornadoes are possible. not to mention an increased threat for hail as well, large hail from omaha back down toward austin, two inch diameter hail is possible. if that weren't enough, come wednesday more thunderstorms return from shreveport to chicago. >> o'donnell: mike bettes, thanks so much. still ahead on tonight's "cbs evening news," the investigation after a fire races through a ups facility. and the tragic death of an nfl quarterback. the questions tonight on how the 24 year old was killed by a dump truck. and we remember a masterful performance at augusta national. performance at augusta national. 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