welcome to bbc news. i'm david willis. our top stories — twitter�*s former security chief says users�* personal data has been put at risk — along with us national security. the company denies the allegations. the united states orders its citizens to leave ukraine — as kiev prepares for heightened attacks from russia, on its independence day. a key day of primaries in several us states — that could set the tone for november's mid—term elections. we'll be live in florida with the latest. days after deflecting accusations of an excessive party lifestyle, the finnish prime minister apologises for an "inappropriate" photo of guests at her official residence. amazing new pictures

ofjupiter, that scientists say can tell us more about the inner life of the planet. and man's "emotional" best friends — how dogs can "cry with joy" when they see their owners. they are detailed, they are showing parts ofjupiter, that we haven't really appreciated before. and man's "emotional" best friends — how dogs can "cry with joy" when they see their owners. welcome to our viewers on pbs in america, and around the globe. the former head of security at twitter has accused the company of hiding negligent practices, misleading federal regulators about its safety, and failing to properly estimate the number of spam accounts that exist on the social media platform. peiter zatco�*s whistle—blowing testimony, which has been

passed to the us regulators, could have serious consequences for the company. twitter says mr zatko�*s allegations are "inaccurate and inconsistent". it says he was sacked — injanuary — for what it called "ineffective leadership and poor performance". our north america technology reporter — james clayton — has this assessment. twitter�*s ceo had a nickname for him, "mudge". this is a really senior person, and he is alleging all sorts of things going on at twitter. the key one for me is bots. he is saying that twitter deliberately undercounts how many bots it has. now, elon musk is trying to buy the company, or at least he was. he then pulled out, saying that twitter had done just that, undercounted the bots. now you have someone inside, the former head of security, saying exactly that. there is a court case in october, where twitter are going to try and force elon musk to buy the company. this is brilliant news for elon musk.

he has literallyjust tweeted an emoji of a cartoon person whistling. a clear indication of how elon musk thinks about this. this is clearly devastating for twitter. they want to force elon musk to buy the company. these revelations will make that much, much more difficult. we can now speak to the washington post'sjoseph menn, who was one of the reporters who broke the story about twitter�*s former security chief accusing the company of security and privacy vulnerabilities. many thanks for joining many thanks forjoining us on bbc world news. why has peters at profile this whistle—blower complaint do you think, what is his motive for this? he complaint do you think, what is his motive for this?— his motive for this? he is very unusual person, _ his motive for this? he is very unusual person, one - his motive for this? he is very unusual person, one of- his motive for this? he is very unusual person, one of the i his motive for this? he is very i unusual person, one of the most famous hackers in america and

he has been at it since the 19905. he has been at it since the 1990s. he has pioneered coordinated disclosure, where security researchers find flaws in programmes and then work with the vendors to establish fixes with the problems before going public. he has done a lot of interesting things, and he was brought in because they were so many breaches at twitter. it was a perennial problem there. very embarrassing things were a teenager would get a hold and tweet as must or donald trump. so he was brought in to fix it and then he was unable to fix it, and he says he sees this whistle—blower complaint is a way of fixing twitter from the outside. either getting such attention put on it and such pressure from regulators that they will be compelled to fix they will be compelled to fix the problem is that he couldn't when he was there. find the problem is that he couldn't when he was there.— when he was there. and what does he believe _ when he was there. and what does he believe that - when he was there. and what does he believe that the - when he was there. and what. does he believe that the threat to national us security actually consists of? there is

actually consists of? there is a few. actually consists of? there is a few- the — actually consists of? there is a few. the most _ actually consists of? there is a few. the most obvious - actually consists of? there is a few. the most obvious one i actually consists of? there is l a few. the most obvious one is that he believes that there are agents of foreign powers working inside twitter for more than one country. he has some basis for thinking that. even though it before he took over as head of security there is a case that came to conclusion in the san francisco court where somebody was convicted after being accused of working for the saudis and is slipping information about dissidents in saudi arabia using twitter. so there is that. he also says there is that. he also says there is that. he also says there is an agent of the indian government inside twitter and there are probably more than that. so there is that sort of national security issue, but also if the security is as terrible as he says, then any government wouldn't have that hard a time breaking into twitter and stealing information about dissidents who are tweeting and ominously at great personal risk.— at great personal risk. twitter remains peiter _ at great personal risk. twitter remains peiter zatco - at great personal risk. twitter remains peiter zatco 's - remains peiter zatco �*s allegations are false, exaggerated and out of date, but this is no ordinary computer hacker we are talking

about here, is it?— about here, is it? that is a really big _ about here, is it? that is a really big issue. _ about here, is it? that is a really big issue. there - about here, is it? that is a really big issue. there is i about here, is it? that is a | really big issue. there is all sorts of mudslinging going on and yes, they say he is a disgruntled former employee who got fired. but if you look at the people who know information security, they know who mudge is. that is his hacker nickname, double. he testified in 1998 under his pseudonym along with others in the hacking group called the loft. pointing out how terrible us security is. they said any of them could take down the internet in half an hour if they worked at it. so he is responsible for speaking truth to power, as they say, and he has had top secret clearance in the united states government. he co—founded one of the first boutiques where talented hackers like himself would go on to big companies and tell

them what they were doing wrong and how to fix it. he is revered among long—time security people. so they are not taking well to the allegations that he is just making it up. that isjust allegations that he is just making it up. that is just not how he works. it making it up. that is 'ust not how he worksh how he works. it will be interesting _ how he works. it will be interesting to _ how he works. it will be interesting to see - how he works. it will be interesting to see the i interesting to see the implications if any foot put up �*s future ownership. thank you forjoining us from washington. —— for twitter�*s future ownership. the us is expected to announce its largest single military aid package for ukraine on wednesday, as the country marks its independence day, and the war there hits the six—month mark. us officials said the new package — which is worth about three billion dollars — is aimed at helping keeve about three billion dollars — is aimed at helping kiev secure its long—term security. well, on the eve of the six month anniversary — our correspondent in kiev — james waterhouse — has been reflecting on the mood of the people of ukraine, ahead of this important date. well, inside ukraine

and inside kyiv, it's very much a constant. it's actually reminding me of the build—up to the invasion, where you had warnings from the west, from the us state department, around concerns of a russian escalation. but of course, six months on, things couldn't be more different. this is a country still under a full—scale invasion, but authorities are wary. they are banning public gatherings. this time last year, there was a huge military procession, in a show of strength. this time around, the main street through kyiv has destroyed or captured russian tanks on display. they've really been quite popular with people, as they walk through, take a bit of interest, pose for pictures. and it's another marker, as ukraine marks 31 years of independence tomorrow. it's also a reminder ofjust how under threat their sovereignty is. so we may well see some high—profile visits tomorrow. we're told friends of ukraine have been invited. how wise that is, given the heightened security risk, isn't clear. the us embassy has urged citizens to leave. that's quite an escalation,

in terms of a precaution, to the irritance of president zelensky. so it will be low—key tomorrow. the city does feel quieter, and it's not just about tomorrow. i think it's the next three days that there are concerns around russia increasing its long—range missile strikes, certainly notjust in kyiv, but across the whole of ukraine. our defence correspondent — jonathan beale — reminds us now of how russia's invasion has progressed over the past six months. bloomer it started in the early hours of february 24th. 24th. this map is a reminder of what ukraine looked like before the invasion. russia already occupied crimea and separatists controlled parts of the east. russian forces then attacked from multiple directions — from the north, the east and the south. western intelligence said russia expected to surround the capital kyiv within a matter of days. but its advance soon stalled with fierce ukrainian resistance.

and by april, russia was retreating from the north to refocus its offensive in the east. but even there, it's been slow progress. it wasn't until earlyjuly that russia managed to capture the entire luhansk region. ukraine's still holding on to parts of neighbouring donetsk. in the south, russia has captured the cities of kherson and mariupol. but ukraine's been preparing for a counter—offensive. six months on, this is the limit of russia's advances. one senior western military chief told me the one certainty so far as russia's chief told me the one certainty so far as russia'- so far as russia's cert so-called _ so far as russia's cert so-called special- so far as russia's cert . so-called special military so—called special military operation has not gone to plan. their command and control has been _ their command and control has been poor, _ their command and control has been poor, their logistics has been — been poor, their logistics has been poor, their logistics has been poor, they have suffered from _ been poor, they have suffered from political interference into — from political interference into the _ from political interference into the conduct of both their strategic— into the conduct of both their strategic operation but also even — strategic operation but also even down to the tactical leveb _ even down to the tactical level. we've seen a lack of trust —

level. we've seen a lack of trust between the military and the political class. all of those _ the political class. all of those things we knew, but i'm surprised _ those things we knew, but i'm surprised that they've had all of them _ surprised that they've had all of them at the same time. their command — of them at the same time. their command and control has been poor, _ command and control has been poor, with _ command and control has been poor, with their logistics has been — poor, with their logistics has been poor, they have suffered from _ been poor, they have suffered from political interference into — from political interference into the _ from political interference into the conduct of both their strategic— into the conduct of both their strategic operation, but also even — strategic operation, but also even down to the tactical tevet _ even down to the tactical level. we have seen a lack of trust — level. we have seen a lack of trust between the military and the political class. all of those _ the political class. all of those things we knew, but i'm surprised _ those things we knew, but i'm surprised that they've had all of them _ surprised that they've had all of them at the same time. the invasion has _ of them at the same time. tie: invasion has become a slow, grinding war of attrition. at times, resembling scenes from the first world war. the ukraine �*s forces dug in, and russia using its artillery to try to break through their defences. the effect, they have

been heavy casualties, with the estimates that tens of thousands of troops on both sides have been killed or injured. ukrainian cities, too, have been reduced to rubble. this is what is left of mariupol. one dynamic that has changed, though, is the supply of western weapons to ukraine. at first, it was small, like these british supplied portable anti—tank missiles. more recently, it has been heavy weapons. like these us high mars rockets can be used to hit russian supply lines from a distance, but is it enough to tip the balance in ukraine's favour? i tip the balance in ukraine's favour? , . , ., , tip the balance in ukraine's favour? , . , ., favour? i expect this to be a lona favour? i expect this to be a long conflict, _ favour? i expect this to be a long conflict, and _ favour? i expect this to be a long conflict, and i- favour? i expect this to be a long conflict, and i don't - long conflict, and i don't think— long conflict, and i don't think there will be decisive action— think there will be decisive action taken this year on either— action taken this year on either side, so whilst there wiii— either side, so whilst there will be _ either side, so whilst there will be counterattacks and counter _ will be counterattacks and counter offensives, and one hopes— counter offensives, and one hopes that the ukrainians will be successful in their objectives, i don't believe it

is something which in this calendar— is something which in this calendar year is going to be decisive _ calendar year is going to be decisive in the year. less than a week ago, finland's prime minister — sanna marin — sparked criticism with a video of her partying, which led to her taking a drugs test. now, the 36—year—old has apologised for a controversial photo taken at her residence. the picture — circulated by finnish media — which led to her taking a drugs test. now, the 36—year—old has apologised for a controversial which led to her taking a drugs test. now, the 36—year—old has apologised for a controversial photo taken at her residence. the picture — circulated by finnish media — shows two women kissing, lifting their tops to bare their torsos, and covering their breasts — with a sign that says "finland". which led to her taking a drugs test. poses and it shows these two women, not sanna marin, but by any typical standards at

women, not sanna marin, but by any typical standards— any typical standards of the internet and _ any typical standards of the internet and many - any typical standards of the internet and many a - any typical standards of the | internet and many a modern society one could argue it is not all that remarkable, you would see thousands, millions of people —— pictures having a party online. the reason sanna marin has apologises it took place in her official residence in helsinki, admittedly in the guest bathroom down in the basement but in her official residence none the less, and critics say it is not appropriate behaviourfor critics say it is not appropriate behaviour for such appropriate behaviour for such a place, a taxpayerfunded building at the end of the day. she has agreed and has apologised and said it was inappropriate behaviour and what we are seeing here is that there are elections taking place in finland next year in 2023, and prior to this, and sanna marin has made no reason to apologise, but i think maybe now she is just trying to control the narrative a little bit, just clamp down on that criticism we have seen in recent weeks.— criticism we have seen in recent weeks. , , recent weeks. some i suppose would see — recent weeks. some i suppose would see this _ recent weeks. some i suppose would see this as _ recent weeks. some i suppose| would see this as inappropriate behaviour for a would see this as inappropriate behaviourfor a prime minister, but she has received some

support, hasn't she? if but she has received some support, hasn't she? if you go oane support, hasn't she? if you go online there _ support, hasn't she? if you go online there is _ support, hasn't she? if you go online there is a _ support, hasn't she? if you go online there is a montage - support, hasn't she? if you go online there is a montage of l online there is a montage of the montage of women doing the same thing, having fun, having a drink, laughing with their mates, at the end of the day doing nothing wrong. what your view is of prime ministerial or presidential behaviour is done to the individual, but she hasn't done anything wrong and i think what we're seeing is actually an interesting in society, and evolution of society, and evolution of society, because increasingly they are going to be more and more people coming into rolls of power and responsibility who have grown up in a world immersed in the internet, with it and alongside it every step of their lives and whether you are 1888 you properly enjoy having a laugh and a drink and a dance with your friends but you might not in certain parts of the demographic of the selfies and the videos of the pictures to go along with it on your phones that might end up on the internet, but young people increasingly are entering that increasingly getting in such positions. i think in two, three, five, ten years' time will we see such a hullabaloo as we see such a hullabaloo as we see such a hullabaloo is where singh currently? i don't this is an interesting pivotal moment that will slowly ebb away.

stay with us on bbc news. still to come: tea rs of joy tears of joy from a tears ofjoy from a dog and a new study says our canine friends may be more emotional than we thought. he's the first african—american to win the presidential nomination of a major party, and he accepts exactly 45 years to the day that martin luther king declared, "i have a dream." as darkness falls tonight, an unfamiliar light will appear in the south—eastern sky. an orange glowing disc that's brighter than anything, save the moon — our neighbouring planet, mars. horn toots. there is no doubt that this election is an important i milestone in the birth- of east timor as the world's newest nation. it will take months, and billions of dollars, to repair what katrina achieved injust hours. three weeks is the longest the great clock has been off

duty in 117 years, so it was with great satisfaction that clockmaker john vernon swung the pendulum to set the clock going again. big ben bongs this is bbc news. the latest headlines: twitter�*s former security chief says users' personal data has been put at risk, along with us national security. the company denies the allegations. washington is set to announce its largest single, military—aid package for ukraine as the country prepares to mark its independence day. polls have closed in the states of florida, new york state, and oklahoma, where voters have been deciding who will represent their party in the upcoming mid—term elections in november. according to a cbs news projection, charlie crist has

won the democratic nomination for governor of florida, which means he will challenge the current governor, republican ron desa ntis. i am joined now by our north america correspondent anthony zurcher who's in florida for us. anthony, he might have one at the nomination but charlie christ is not going to beat rhonda sanchez, is he? charlie christ is a _ rhonda sanchez, is he? charlie christ is a veteran _ rhonda sanchez, is he? charlie christ is a veteran of— christ is a veteran of republican politics. he actually was a republican governor in 2008 and switched parties to the democrats, run unsuccessfully as a democrat for governor and now is running iii time once again as a democrat, trying to take on rhonda sanchez. in his victory speech, he talked about abortion being a very key issue and he talked about appealing to republicans, independence and democrats and he tried to paint rhonda sanchez of someone

who was outside the mainstream who was outside the mainstream who was outside the mainstream who was taking away individual freedoms in florida upwards stands in starc contrast from what i heard on the stage yet where he was boasting about being the free state of florida and that he will protect individual freedom so it will set up a very interesting dynamic in this election when i should note that the governor's race in forrester, the past three elections has been decided by about 1%, so it is always very close in this pivotal sweepsta ke. always very close in this pivotal sweepstake. always very close in this ivotal swee stake. �* ., pivotal sweepstake. and what we are seeinu pivotal sweepstake. and what we are seeing tonight _ pivotal sweepstake. and what we are seeing tonight could - are seeing tonight could possibly be a launchpad for ron desantis presidential bid, the run in which he will take on donald trump for the republican nomination?— nomination? right now, if you look at faults, _ nomination? right now, if you look at faults, ron _ nomination? right now, if you look at faults, ron desantis . nomination? right now, if you look at faults, ron desantis is doing fairly well in a head—to—head matchup against trump is still at the favourite among republican voters across the country that margin has been cards in recent months.

rhonda sanchez clearly has presidential ambitions and his victory speech today here on the stage, he tested out some messages he might use to run for president, talking about education rights which is a big issue for conservatives, talking about fighting against transgender athletes in college tra nsgender athletes in college and transgender athletes in college and high school sports. and, of course, his stand against covert restrictions for something that got him a lot of approval and support. he went to that as being one of his major achievements as governor here in florida.— here in florida. also tonight, the race in — here in florida. also tonight, the race in new— here in florida. also tonight, the race in new york, - here in florida. also tonight, the race in new york, a - here in florida. also tonight, l the race in new york, a special election that that has been regarded as a potential bellwether for the midterms i believe. tell us about that. it believe. tell us about that. it is. that special election, whoever wins it, is only going to serve on office for a few months before they will have to run for re—election in november

but both the republicans and the democrats are seeking a lot of money in it trying to win that seed because it was a congressional seat thatjoe biden carried by two percentage points in 2020, so it is a very marginal seat. we could go either way. we could be an indication is that the republicans are building towards a wave election whether takeback congress in november, or a sign that democrats are — in rates they have made recently — passing legislation in congress, inflation going down, the economy looking a little better and abortion becoming a front and centre issue. all of that is helping turn of the economy looking a little better and abortion becoming a front and centre issue. all of that is helping eternity title democrat so i think you will hear one side or the other, claiming this bodes well for them in november. many thanks forjoining _ well for them in november. many thanks forjoining us _ well forthem in november. many thanks forjoining us therefrom florida. let's get some of the day's other news an eu agency has warned that europe is on course

for its worst drought in more than 500 years. in a new report, the global drought observatory says that two—thirds of the continent is currently under some form of alert, and that — as well as reducing crop yields, the conditions are drying up rivers, and sparking wildfires. a human rights group says that qatar has deported some migrant workers after they protested against not being paid. equidem says labourers from india and bangladesh were among those forced to leave. qatar's government said some protesters were detained, but it hasn't confirmed whether any were expelled. qatar is preparing to host the men's football world cup in november. a tennis fan is suing the australian player nick kygrios for defamation after he accused her of being drunk at last month's wimbledon final. kyrgios, who lost to novak djokovic, complained to the umpire about anna palus, claiming she looked like she'd had �*about 700 drinks'.

ms palus described the accusation as �*baseless'. nasa has released never—seen—before pictures of the solar system's largest planet, jupiter, which were taken last month by the new super space telescope, james webb. the images show au—roras, giant storms, moons and rings in detail that astronomers have described as �*incredible.’ here is our science correspondent, helen briggs. jupiter in a whole new light. the famous great red spot, a storm larger than earth, visible as a radiant white dot. glowing light shows — or auroras — dancing at the poles. faint rings, and two of the planet's many moons, standing out against a backdrop of glittering galaxies. scientists say the stunning new images, artificially coloured to make the features stand out,

are better than they could ever have hoped for. these images are so much more than just pretty pictures. yes, they are pretty, aesthetic, glorious. but they're crisp, they're detailed, they're showing parts of jupiter, of its cloud cover, that we haven't really appreciated before. this isjupiter, as seen through the hubble space telescope. hubble's more powerful successor, the james webb, was launched in december. and since the summer, it's been sending back extraordinary images of the universe. over the years to come, the telescope will be peering ever further back in time, transforming our knowledge, both of distant worlds and of planets in our own back yard. helen briggs, bbc news. amazing stuff indeed. we've all been told that

a man's best friend is his dog. well, the feeling may well be mutual. apparently dogs can cry tears of joy when they are reunited with their owners. buddy, woody and mia can't wait for their owners to pick them up. they have been in doggy daycare all day. injapan, scientists said they found a detectable emotional response when dogs are reunited with their owners. it was only a small study with just 22 dogs, but they said they could detect real tears. eleanor, who sees the dogs reunited with their owners every day, is sceptical, and thinks they might be barking up the wrong tree. i've never seen a dog crying, so i'm not sure about it, but they definitely have emotions and i see the excitement when their owners come to pick them up, whether that is after eight hours of being here or two weeks. of course, they get excited. there's no doubt that dogs form a strong emotional tie to people and they have been plenty of studies to show it. this is jasper, and he's definitely pleased to see eleanor. this is coco, and i've made friends with coco

with a few bribes. she is obviously happy to see me, but i can't see her shedding any tears when i go. always knew the feeling was mutual. stay with us on bbc news. hello, there. there was a lot of late august sunshine to be found on tuesday. all it was a beautiful day across much of scotland, as you can see from highland, but here, temperatures sat in the high teens, low 20s. now, further south and east of that, again, lots of sunshine, but it was hot and it was humid with it. in fact, suffolk saw the highest temperature on tuesday afternoon of 29 celsius. as we move into wednesday, this weather front will produce some rain, but it's also the dividing line between fresher air to the north and west and somewhat humid conditions continuing across much of central and eastern england. so, yes, we will see some rain, some of it heavy at times across west wales and then gradually pushing into north west england.

a few isolated showers further north and west, but here it will be predominantly dry, breezy as we go through the day, but those temperatures once again sitting in the high teens, maybe low 20s. to the south and east of that weather front, our temperatures again on the high side, 25—30 degrees, and it will be very humid with it as well. now, as we move through wednesday evening, into the early hours of thursday morning, our weather front doesn't move very far very fast, and when it does so, it will weaken off considerably. so a band of cloud and a few patchy showers moving across the pennines, but to the south and east of that, there's a risk of some thundery downpours developing in the south—east. and with the temperatures staying on the high side, 17 or 18 degrees, some of those showers really could turn quite heavy and thundery. so during the early hours of thursday morning, we could see across essex, kent, suffolk and maybe north norfolk some sharp showers drifting their way steadily eastwards. they will be fairly isolated and only on those eastern fringes, but any rain in these areas is certainly going to come as welcome news.

cloudy skies following on behind, brighter skies behind, with a scattering of showers in the far north—west. noticeably fresher for all — 15—24 degrees the high as we move out of thursday. now, friday, into the start of the weekend, sees a weather front push into the far north—west and the wind direction changing. so it looks likely that the far north could stay cloudy with outbreaks of rain at times, potentially. elsewhere — and, yes, it's a bank holiday for northern ireland, england and wales — dry, settled but fresher.

this is bbc news. the headlines — a former senior executive at twitter, peiter zatko, has presented allegations to the us regulators claiming that the online platform misled them about security problems. he has said they placed personal user data and potentially us national security at risk. twitter has denied the allegations. washington is set to announce its largest single, military—aid package for ukraine — as the country prepares to mark independence day. the united states is also urging its citizens to leave ukraine — after warning that russia is planning to step up attacks on civilian buildings around independence day. polls have closed on a day of primaries in several us states that could set the tone for november's mid—term elections.

the democrat representative, charlie crist has won the primary in the us state of florida —