military, the besieged city of mariupol. they say the city is surrounded. ahead i'll talk with a u.s. combat veteran whose group has gotten more than 400 people out of ukraine. here at home, new concerns about the pandemic as we emerge from a busy holiday weekend. and what a white house covid official is now advising about booster shots for seniors. also, three words you probably don't want to hear. it's tax day. even worse, the irs is understaffed, facing a backlog. what you need to know and how the white house is trying to put the focus now on what billionaires and large corporations should be paying but we start this hour with the war in ukraine. nbc's matt bradley is in kyiv and i want to bring in an msnbc senior contribute and former member of the foreign relations committee. >> air raid sirens have been blasting all morning, at least seven killed and injured including one baby killed in the missile attacks. you can see the civilian car repair shop, there are dozens of destroyed vehicles on the other side of these railway tracks, these buildings are destroyed and fire crewing several hours later still putting out smoldering remains. it is unusual for vladimir putin's forces to strike this far west into ukraine. lviv had been relatively safe and people had been coming here from the east and seeking refuge here or moving further on in europe. in is putin signaling nowhere is safe. attacks here have been in retaliation to ukrainian strikes inside russian territory. the ukrainian military not responding to that. but what many people here suspect is this is putin retaliating for the humiliation his forces suffered out on the black sea with the sinking of his flagship, the moskava. >> i know you've been reporting on what's going on a lot in mariupol, that besieged port city. what are you learning? >> rafs said it all. in mariupol we're talking about a city under siege for more than 50 days, shortly after the war started. mariupol is crucial for vladimir putin's ambitions in ukraine because it provides a land bridge between crimea, that peninsula that putin sized back in 2014, the last time the russians invaded and mainland russia. mariupol has been stubbornly defending itself against a russian advance. it was not so long ago a city of about 450,000 people. now there's only about 100,000 people and there have been attempts over and over again to make humanitarian corridors, ways for people to get out of mariupol and other areas of ukraine. these take negotiations between ukrainians and russians they keep being violated, according to ukrainians, by russian shelling. this is a city where elderly people have been living without food, without clean water, without electricity or heat in what was a couple of weeks ago frigidly cold weather and now it looks as though the russians are finally within striking distance of taking the city but we've heard from politicians in kyiv and ukraine, sounds like they are willing to fight to the death. it will be what sounds like a blood bath, kind of almost a martyrdom to those soldiers who remain. mariupol has become a symbol of the crucible of what mariupol is. we see images of mariupol and its suffering. this is something that inspires ukrainian despite images of the incredible cruelty being exacted on the population there. if fairway falls, despite the stalwart defense and it looks like it will, if it falls, ukraine will end diplomatic relations between ukraine and russia. it would be mostly symbolic. let's be honest, jose, up until now, diplomacy has been tried, tested and failed. and so far all it's done along with just about everything else in this war is put putin's backup, made him more angry, more desperate and more humiliated. jose? >> it's really extraordinary what the ukrainian people are showing throughout these 50-plus days. specifically in mariupol, one wonders what is putin willing to do to take mariupol? what is he willing to use to take mariupol? >> that's a question that everybody has been asking and it's one that president zelenskyy and a lot of politicians and a lot of fighters in mariupol seem to have an answer to. they say putin has already used chemical weapon. last week there was a lot of talk that there were traces of chemical weapons, some soldiers came ill. they weren't severely ill but showed signs, according to ukrainians, of being affected by some chemical weapons. we can't even talk to ordinary people in mariupol. we can't reach them by phone, we can't make a zoom call with them. the people i've been speaking to are people who have left mariupol and they can't even contact their loved ones so there's no way of checking. the other really ominous thing here and this is something president zelenskyy has signalled time and time again are the use of nuclear weapons. russia is a nuclear armed power. it's unlikely he would nuke mariupol but he might use smaller, tactical weapons, the kind of weapons that are nuclear charged that would be on a conventional battlefield and they would still inflict a lot of lasting damage. >> thanks for being with us. i want to bring in clint watts at the big board. talking to matt, it just so horrendous what is going on throughout that country and mariupol. i want to ask you later to focus on. but it seems like the russians have been changing their tactics but not their brutality. >> that's right, jose. i think the big story here is in the east. this is where we're seeing the shift in terms of everything that's going on right now. so those forces from kyiv we seen redeployed over the past two weeks, they've come in from belgorod. separately from luhansk. and they'll cut them off, similar to what we see them doing in mariupol. this is that russian front i was drawing, essentially trying to link these forces. i expect there will be a major battle for slovyansk. they'll try and defend here. they want to prevent the forces to donetsk and cutting off ukrainian military in these pockets here. the russians in order to do that have to move their combat power from the south. and that specifically is what we've been talking about today here in mariupol. mariupol, the remaining fighters and civilians that are there are based largely in this iron and steel factory. this area is quite a large area, as you can see on the map. when you look at it a little bit closer, you see it is the kind of place where it's very easy to defend in certain circumstances but they're surrounded on all sides. the ukrainian military has refused to surrender probably because they've seen what's happened in places like bucha where the russian military will go and just murder and kill people. the longer they defend here, the tougher it will be for the russian military. you can see this block-by-block battle heading toward this iron factory. if you're the russian military trying to advance, it's one of the last places you'd want to assault in an urban environment. >> matt was talking about there really is no way of knowing what exactly is going on in mariupol because of the lack of communication. i'm thinking of siege of malta in 1655. is it inevitable that they will be overrun? is it inevitable that the ukrainians will lose mariupol or is it possible that they could hold out and, clint, why so important for russia to get mariupol? >> a big picture i think it's very difficult for the ukrainians to last forever. food and water is their biggest weakness at this point. how do they resupply? they really can't. when you zoom back out and look at thissia irin the south, you'll see mariupol surrounded essentially by red. they connected this land bridge here and mariupol basically surrounded, no way to resupply or withdraw without surrendering to the russian military. the russian military, they have to take this point. it's the last point on the sea of azov. >> and president zelenskyy is asking for more military supplies. ukraine is rapidly running through artillery and artillery rounds. we're sending $700 million in more aid. what more should we be doing and is that enough? >> no, it's not enough. what we're seeing is a war of attrition against the ukrainian people. it's not just attacks in places where there's combat going on like in mariupol. the attacks this morning on lviv are emblematic of everything that's been going on and the country. we operated on a ratchet. we started small, then gave them a little more sanctions, a little more weapons and heavy artillery. they need us to be all in because this isn't all in quite for them and we want them to win. >> it interesting, putin just said recently that the west's economic blitz against russia has failed. has it failed? has it made a difference in russia? and what is putin -- who does putin need to keep happy in order to continue ruling? >> that is the $64,000 question. who he needs happy, we don't know. he's put a lot of people in prison. i don't think the goodwill of all of those oligarchs is important to keeping him power. you ask if the economic sanctions are biting. absolutely they're biting. you see lines and lines of russians on the border trying to get out so there's no about that. but i think russian people as best we can see right now remain with president putin and that's really a war that has to turn. >> on congress two lawmakers are the first u.s. officials to visit ukraine, congresswoman sparks and montana senator steve danes. these are the two u.s. representatives who have been there. should the united states, should the federal government, should president biden send someone in to show ukraine and the world the united states is with them? >> it raut dozen hull when he went there, it showed that the world is standing with ukraine and that the world is on ukraine's side. so i don't want to make silly recommendations that the president should go or shouldn't go. i think there are very important ways that the united states can show its support and the president should consider whether going is one of them. >> daniel pletka, thank you for being with us this morning. >> john kirby will join andrea mitchell coming up in our next hour. for all the procrastinators out there, you have a couple of hours left to file your taxes on time. even if you get it done, if you're getting a return, it could be slower than usual. we'll dig in to what to expect. but first, millions of people are back at home after traveling for easter, passover. but could they have brought covid home with them? 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- good right? right now nearly 30,000 runners are taking over the streets of boston. it's the first time since the start of the pandemic that the boston marathon is taking place in its original spring start date but no covid protocols are in place along the marathon route for runners and for spectators. it comes as covid cases tick up across the country. as the holiday weekend wraps up, many americans are making their way home again. joining me now, allison barber and the managing director at opportunity labs, a former pandemic and emerging threats coordinator at the department of health and human services. allison, great to have you back. figures screened more than 2 million runners. what are you seeing? >> reporter: it is a busy airport weekend. it feels like a continuation of what we saw in the winter holiday during those big heavy periods of travel where numbers were getting close to pre-pandemic levels. now seems to be a continuation of that uptick, even higher numbers now. when we speak to people here, most people we see and talk to, they are taking precautions and they say at this point they feel pretty comfortable in airports and on planes. listen to what we heard. >> boston's pretty busy this weekend, just with the marathon, the celtics had a huge game, the red sox. so the airports getting there and leaving today were pretty packed. >> traffic travel was not bad. it was good. >> i feel like it's getting back to normal. the mask mandate is still a thing. some find it annoying but i think it's responsible. >> we are seeing an uptick in infections across the country. by and large, the rate of hospitalization seems relatively stable. you're at this moment in time when gas prices are high. you have some airlines like jet blue saying they're going to cut back on flights because they're having issues with staffing are pandemic-related shortages. all of that, even if travelers are aware of it and by and large they are, they still are wanting to get out and about and return to their normal lives. for a lot of people this wasn't just their first trip back to normalcy to the holidays but it was a second or third and they say they feel pretty comfortable traveling. >> and alison was talking about how right now covid hospitalizations, the admissions are low but cases are rising and as we saw the volume of travelers over the weekend, a lot of people are getting back to a routine that they had not been doing for two years now. with the warmer weather around the corner, how do people stay vigilant? >> the whole paint of what we've been doing over the last two years has been to get to this and people resuming their normal lives. it takes a little bit of thoughtful prevention, making sure what you're vaccinated and making sure you get your booster shot, generally two weeks ahead of when you're scheduled to travel and be and or people. and the other thing i tell people is you have to think about what the community risks are where you're going. if you're younger than 65 and don't have medical conditions, it's pretty safe. and if you do fall into one of those categories, you should talk to your doctor. you can participate but there are things to reduce your risk. >> i spoke to a doctor who attended a wedding who went to mexico got covid, none of them very seriously. is it time to say covid's going to be with us, it's just going to happen and let's try to row protect ourselves as we can but odds are somebody's going to get it? >> we're at a place where the virus is not going to go away. we're going to continue to hear about infections and waves and we have to continue to live our lives in that context. that's something different than just saying this is going to happen and we're going to let it rip. there are things we can do to adjust our own risk, adjust the public's risk and make sure we try to keep people as well protected as possible. but that takes a measure of personal responsibility as well, making sure to assess the risk of the area you're going to and making sure you're getting vaccinated and you get a plan to get tested and treated if you start to have symptoms. >> dr. hashish ja spoke yesterday. >> the data out of israel is pretty clear that it reduced deaths. >> how important is it to get that booster shot and how effective is it? >> it's a really good idea right now. this is something we struggled to communicate. your risk changes with time and is influenced by a number of variables. it's influenced which vaccine you got, how far you are out from your booster and what are your other risk factors. reflected in data from israel and hong kong and other places is the risk from ba.2, particularly folks over age 65 is significantly elevated compared to younger people. the protection is still pretty good in the younger age groups. it's possible that could change as we get further out and it might be necessary as we get further out that people in young age groups also have to get more shots. the benefit right now is really for people over age 65. >> thank you both for being with us this morning. appreciate it. >> i have news for you. you just have a couple of hours left to file your taxes on time. up next, why it could take longer than usual if you're lucky enough to be getting a refund. and the message the white house is sending about president biden's tax plan. you're watching "jose diaz-balart reports." e diaz-balart reports. but if you have moderate to severe rheumatoid arthritis or psoriatic arthritis, enbrel can help you say i'm in for what's next. ready to create a bigger world? 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>> jose, it interesting. because of course today is tax day and the white house isn't necessarily unveiling a new tax plan from the president but they're using this occasion to sharpen the contrast and we have to mention it, it's an election year, between democrats and republicans. what the white house is doing today is pointing to what the president has proposed, which include repealing those trump tax cuts on the highest income earners, those earning more than $400,000 a year, as well as imposing a new billionaires minimum income tax, those making more than $100 million a year to pay at least 20% of their net worth in income taxes. versus what republicans are proposing. they say what congressional republicans are proposing and they say their plan would put $100 billion in new tax burden on middle-class americans and put medicare at risk but they're talking about rick scott, the republican senator from florida. he is the chairman of the republican senate committee but he has done this in his own capacity. this is not a position endorsed by the republican party. the rnc for its part is using today to say that what president president biden has put forward in his budget in terms of direct taxes and indirect fees and payments and the like would amount to $2.5 trillion in a tax burden that would also be felt by the middle class. this is an election year. as i say, the president using today to do what he has done often in the past saying don't judge me against the almighty but judge he against the alternative. expect to see more from the president as the weeks move on here doing a side by side between his party and republicans. >> between budget cut and a pandemic worker shortage, the irs is under serious strain to get people their tax refunds. business and technical correspondent jolene kent takes a closer look. >> reporter: even if you are on top of your taxes this year, uncle sam is already behind. the irs kicked off this season with approximately 6 million unprocessed returns from last year, that's 5 million more than usual. plagues by workers leading the pandemic and budget cuts, over 15,000 employees handled over 240 million calls in the first half of last year. that's just one person for of 16,000 calls. the irs is attempting to hire 10,000 new seasonal workers this year to process taxes. >> how urgent is the need to hire 10,000 people? >> we want everyone to come work for the irs tomorrow. >> the most critical need, tax examiners and clerks, entry level positions. the irs even receiving special authority to bypass typical federal hiring rules and offer jobs on the spot like holding this job fair in austin. deborah got hired as a part-time clerk in half an hour. >> probably the best job interview experience i've ever had. >> all they they over health insurance and vacation time, the competition is tough. the jobs star at $15 an hour with a $1,000 signing bonus and amazon's is $18 an hour with as high as $3,000 bonus and target starting at $24 an hour. >> it is very competitive out there. >> after filing his taxes last week, father of three is hoping his $11,000 refund will come by june. >> we need the money right away. >> he and his money need it to pay bills with inflation driving up the cost of everything and helping them avoid going to food pantry to get groceries. >> what do you say to taxpayers who are eager to get that refund as quickly as possible? >> i would say we are eager to get them to you as well. that's why we're super committed to getting these on board. >> thank you. millions of people have fled ukraine since the russian invasion began, but it always is a difficult, often dangerous journey. i'll talk to the founder of a group that rescues americans stuck in war zones. they say they've evacuated more than 600 people from ukraine how have they done that? we'll find out next. you're watching "jose diaz-balart reports" on msnbc. t. , where i compared home insurance rates. we don't need to print the internet. some are beyond help. i will give you $100 if you can tell me what this is. -scotch egg. -it's a meatball. progressive can't help you from becoming your parents, but we can help you compare rates on home insurance with homequote explorer. we've got a lot of work to do. i could've waited to tell my doctor my heart was racing just making spaghetti... but i didn't wait. i could've delayed telling my doctor i was short of breath just reading a book... but i didn't wait. they told their doctors. and found out they had... atrial fibrillation. a condition which makes it about five times more likely to have a stroke. if you have one or more of these symptoms irregular heartbeat, heart racing, chest pain, shortness of breath, fatigue or lightheadedness, contact your doctor. this is no time to wait. contact your doctor. living with metastatic breast cancer means being relentless. because every day matters. and having more of them is possible with verzenio. the only one of its kind proven to help you live significantly longer when taken with fulvestrant, regardless of menopause status. verzenio + fulvestrant is for hr+, her2- metastatic breast cancer that has progressed after hormone therapy. diarrhea is common, may be severe, or cause dehydration or infection. at the first sign, call your doctor start an anti-diarrheal and drink fluids. before taking verzenio, tell your doctor about any fever, chills, or other signs of infection. verzenio may cause low white blood cell counts, which may cause serious infection that can lead to death. life-threatening lung inflammation can occur. tell your doctor about any new or worsening trouble breathing, cough, or chest pain. serious liver problems can happen. symptoms include fatigue, appetite loss, stomach pain and bleeding or bruising. blood clots that can lead to death have occurred. tell your doctor if you have pain or swelling in your arms or legs, shortness of breath, chest pain, and rapid breathing or heart rate, or if you're nursing, pregnant or plan to be. every day matters. and i want more of them. ask your doctor about everyday verzenio. the missile strikes on lviv are raising the stakes for humanitarian workers. it's been a relatively safe haven for people in ukraine east and south. the mayor said at a news conference, quote, there are no safe cities in ukraine today. i want to bring in brian stern, co-founder of project dynamo, a nonprofit helping to evacuate americans out of ukraine. it's great to see you. thanks for being with us. between these new strikes on lviv and this land stand we're apparently watching play out in mariupol, we're seeing how quickly the dynamic can shift on the ground. how dangerous is the situation in ukraine right now? >> thanks for having me. the situation on the ground is -- this is a war zone. people die out here every single day. mostly civilians but even the troops. so ukraine is a war zone and it has all the things that a war zone has from artillery to aircraft, to missiles, to catastrophes and dead babies and everything in the middle. >> a spokesman for your group told the "miami herald" your group has evacuated more than 400 people from ukraine so far with, quote, multiple rescue operations on the way. what does that look like? >> we do rescues almost every day. we're pulling 60-something people out as we speak, my team. so they do range. sometimes they're harder than others. sometimes they're extremely dangerous, sometimes they're extremely complicated. so there is no cookie cutter solution on how to do a rescue out of a war zone of anyone. we've done premature babies that are on ventilators and incubators and feeding tubes and rescued americans surrounded by russians with tanks parked on their street. it does run the gamut. we try not to say no a whole lot but the threat environment has to be able to allow to us operate at the same time. >> how do you actually do the things that you mentioned and i'm sure a lot of the other things that you haven't? >> we -- the secret to dynamo is that we built the human and physical infrastructure needed to do rescue operations before the war. we have a -- and we kind of piled on to this problem set early on starting actually in january, during the build up and again all through february. how we actually do it, we'd be here for a long time. it's a lot of homework, a lot of three-dimensional chess, it's about understanding the environment, both the russian and the ukrainian side. from just plain old homework with respect to route reconnaissance takes a lot of time, effort, monday. we are downfunding. that is what keeps us afloat. >> and i know you did some of the work with the u.s. pulled out of afghanistan last year. are you still actively working in afghanistan? >> we are. thanks for asking that question. people think that we've pivoted to ukraine. we did not. we expanded to ukraine in a very real, deliberate way. we still have operations going on in afghanistan. those operations have slowed down a little bit given the threat and also the needs on the ground. the needs here in ukraine are significant, significant. much different than the afghanistan problem set. >> the afghanistan problem set, to use your words, continues. i think that it's fair to say, has just gotten worse? ? correct. all these places are definitely getting worse, not better. we have no shortage of people asking for hem. we get requests every single day from all over the place, focused mostly ukraine and afghanistan but other places, too. the hot spots around the world seem to be more problematic, not less problematic as time about that's kind of our hope and dream. nobody wakes up hoping to need to be evacuated or to become a refugee or any of those things. so it is a challenge for sure. >> indeed it is. brian stern, thank you for being with us. i very much appreciate your time. >> thank you very much. appreciate it. >> coming up, from pittsburgh to portland to south carolina, police are investigating four separate mass you're watching "jose diaz-balart reports." g "jose diaz-balart reports. maybe it's another refill at your favorite diner... or waiting for the 7:12 bus... or sunday afternoon in the produce aisle. these moments may not seem remarkable. but at pfizer, protecting the regular routine, and everyday drives us to reach for exceptional. working to impact hundreds of millions of lives... young and old. it's what we call, the pursuit of normal. ♪ ♪ [♪♪] if you have diabetes, the pursuit of normal. it's important to have confidence in the nutritional drink you choose. try boost glucose control®. it's clinically shown to help manage blood sugar levels and contains high quality protein to help manage hunger and support muscle health. try boost® today. an airbnb, a night club, a crowded mall. these were all scenes of mass shootings of a violente holiday weekend. police are still searching for suspects involved. nbc's blayne alexander is following all of it. good morning, what do we know about the investigations into these shootings? >> reporter: jose, let's start with that shooting in pittsburgh that happened at the crowded party. 200 people inside, and most were underage. they were just teenagers. we're learning more about the two people who lost their lives. we understand that they were 17 years-year-old. of course that's one of several events that turned out to be a violent holiday weekend. this cell phone video shows the frantic moments when gunshots shattered the peace of the holy holiday weekend. it happened at a packed house party in pittsburgh. officials say nearly 200 mostly under age young people were crammed inside of an airbnb, injuring eight people and leaving two teenagers dead. >> we have to figure out where these guns are coming from, especially for the youth. >> reporter: it's the latest in a violent weekend on the east coast, three mass shootings within just 24 hours. >> i've got five patients waiting to be transported. >> reporter: in columbia, south carolina, 22-year-old jawayne price open fired in a crowded mall wounding 12, in what officials called a targeted attack. price has been released on a $25,000 bond and placed on house arrest. another shooting in south carolina, this one at a lounge, 80 miles west of charleston leaving nine injured. all of it comes less than a week after a terrifying morning on a new york subway when a gunman threw smoke canisters, and opened fire aboard a train in brooklyn, hitting ten people. the suspect in that case has been arrested. and jose, on top of those three shootings, unfortunately we have one more to tell you about, a shooting that happened sunday evening in portland, oregon. one person was killed. three others, three of them, under 18 were injured in that shooting. >> blayne alexander, thank you. the web site info wars owned by alex jones has filed for chapter 11 bankruptcy in texas. it comes after the site was found libel for damages in three lawsuits last year. they centered on jones' false claim that the 2012 sandy hook shooting was a hoax. coming up, a mystery potentially dating back 800 years. what archaeologists have just discovered at the notre dame in paris. you're watching "jose diaz-balart reports". 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"andrea mitchell reports" starts right now. good day, everyone, this is "andrea mitchell reports" in washington. a new wave of attacks in lviv today as ukraine military leaders say vladimir putin's troops are replenishing forces for a new deadly offensive. surprising rocket attacks leaving at least seven people dead, eleven others injured, including a 3-year-old. the cruise missiles hit ukrainian military infrastructure and a warehouse. the most intense fighting continues to be in mariupol where ukrainian troops low on ammunition and food are trying to hold off russian forces from gaining control of the kyiv port city. and in northeast kharkiv is under fire including a missile attack at one of jose andres nonprofit world central kitchen food centers. chef andres joins me later this hour with an update. we begin in lviv, joining me now, nbc's raf sanchez. you traveled to the area the missiles hit. what can you tell us. >> reporter: well, andrea, you can see behind me now, the situation in lviv is relatively calm. people are out on the streets, but all morning here, the air-raid sirens have been blaring as vladimir putin's cruise missiles have rained down. as you said, a