this is bbc world news. i'm tim willcox. our top stories: world tennis number one novak djokovic is returned to the same melbourne detention centre wherte he was first held to the same melbourne detention centre where he was first held as his lawyers continue to challenge his latest visa cancellation. one of borisjohnson�*s ministers calls his behaviour "unacceptable", after downing street apologised to the queen for number 10 staff lockdown parties on the eve of prince philip's funeral. the us accuses russia of planning to create a pretext to justify invading ukraine. and how scientists looking into why space travel makes astronauts anaemic when they return to earth may help patients in intensive care.

hello and welcome to bbc news. tennis world number one, novak djokovic has been taken back to the same immigration detention facility in melbourne where he was first held earlier this month, following the latest cancellation of his visa. his lawyers have appealed the decision with a hearing scheduled in the federal court on sunday morning local time. djokovic is still scheduled to play in the australian open in melbourne on monday. let's get more more now from melbourne. our correspondent, phil mercer, is there. back to where it all started? that's right. it is ten days or so since novak djokovic was detained at melbourne airport,

his visa was cancelled and taken here to the park hotel, just a short distance from melbourne city centre. this is an immigration detention centre that also houses a silent seekers and refugees, hence the presence here of various campaigners. —— asylum seekers. we understand novak djokovic arrived in one of two white cars. the consensus among the photographers and camera crews is that novak djokovic was inside one of those vehicles. there were a few police officers and other security guards. windows were tinted and it was pretty chaotic but we do understand that novak djokovic is back in detention and first thing on a sunday morning, a full appeal into that cancellation of his visa will begin. so this long—running saga still has a few more chapters to run. extraordinary

turn of events. _ chapters to run. extraordinary turn of events. he _ chapters to run. extraordinary turn of events. he is - chapters to run. extraordinary turn of events. he is in - chapters to run. extraordinary turn of events. he is in a - turn of events. he is in a single room, not allowed to leave the hotel. what are conditions like?— leave the hotel. what are conditions like? not great according _ conditions like? not great according to _ conditions like? not great according to other- conditions like? not great i according to other detainees inside of this facility. there were stories in the last few days that some of the food is pretty unappetising at best and that conditions are pretty rough. we understand also there was a fire at this facility as well. quite clearly not the 5—star luxury the world number one tennis champion is used to and how this disrupts his preparation for the australian open will have to see and that is if he is to play because today lawyers fought novak djokovic have filed their submissions and the government anotherfew hours to submissions and the government another few hours to make its submissions as well. this is heating up to be an almighty fight in the federal court here

in melbourne, local time on sunday morning. fix, in melbourne, local time on sunday morning.— in melbourne, local time on sunday morning. a lot of people must be scratching _ sunday morning. a lot of people must be scratching their - sunday morning. a lot of people must be scratching their heads. | must be scratching their heads. when lawyers appealed to the firstjudge, he granted the appeal. we saw him at training over the past few days. if it is taken at the personal discretion of a minister, one wonders how much more difficult it is to challenge that? the immigration _ it is to challenge that? tue immigration minister it is to challenge that? tte immigration minister alex it is to challenge that? ttj: immigration minister alex hawke is a close political ally of the centre—right minister scott morrison. all the way through this djokovic saga mr morrison has insisted the tennis player should be deported. it has taken his immigration minister, alex hawke, a few days after the initial court hearing and decision on monday to revoking his visa once again on friday so you would have to think that the government spent that intervening period trying to

make it case as watertight as it possibly could. the job for novak djokovic's lawyers is to convince appeal courtjudges that that decision by the immigration minister was unreasonable so it is a legal minefield, if you like, for both sides and the stakes are enormous. if the australian government loses it will suffer humiliation stop if novak djokovic loses he's his way home, losing the ability to win a 10th australian open title. an election is not too far away? —— elections. an election is not too far away? -- elections. absolutely ri . ht. away? -- elections. absolutely right- we _ away? -- elections. absolutely right- we are — away? -- elections. absolutely right. we are expecting - away? -- elections. absolutely right. we are expecting a - right. we are expecting a federal election here in australia in may so lots of talk and are reporting about the political aspect to the novak djokovic saga. it has been a momentous political decision by the australian government because of the risks we have been explaining. if it

loses this appeal, it will be humiliated, if it wins you can say to the australian public, we are tough on borders, tough on pandemic controls and that is why we say the stakes are enormously high here. there is another critical part of the story, the timeframe for all of this is pretty tight because novak djokovic is due to compete in the first round of the australian open on monday so the window of opportunity to get this all sorted out one way or another is getting pretty tired. ~ ., , ., or another is getting pretty tired. ~ . , ., ., or another is getting pretty tired. . , ., ., ., tired. we have seen a lot of suworters _ tired. we have seen a lot of supporters behind - tired. we have seen a lot of supporters behind you - tired. we have seen a lot of supporters behind you in i tired. we have seen a lot of - supporters behind you in recent days but would you think public opinion is hardening in australia about the decision to actually let him stay? we have seen here _ actually let him stay? we have seen here at _ actually let him stay? we have seen here at the _ actually let him stay? we have seen here at the park- actually let him stay? we have seen here at the park hotel. actually let him stay? we have seen here at the park hotel in| seen here at the park hotel in recent days, we have seen lots of serbian australia is coming out voicing their support for

novak djokovic but my guess is, and it is only a guess, it is very difficult to encompass the views of 25 million australians, but my guess would be that most australians want novak djokovic to go. this is a country that is suffering under tens of thousands of new coronavirus infections each and every day and this sort of public health territory, this country has not been in since the pandemic before. the vast majority of australians, more than 90% are vaccinated and there is a feeling in the community i would say that here is a wealthy, foreign athlete who has tried to circumvent the regulations. there are others who think novak djokovic has been pretty badly treated. it is safe to say that everyone in bob nfs has made mistakes along the way, the government, the

tennis players, and the tennis authorities. —— everyone involved in this has made mistakes.— involved in this has made mistakes. ~.,, ., , mistakes. phil moser outside the detention _ mistakes. phil moser outside the detention centre - mistakes. phil moser outside the detention centre in - the detention centre in melbourne. —— mercer. a uk government minister has criticised borisjohnson�*s behaviour as "unacceptable" and said he must run downing street in "a very different way". guy opperman broke ranks after number ten apologised to the queen for two lockdown parties held by staff on the eve of her husband's funeral. the prime minister didn't attend either party but the latest disclosures have amplified calls for him to resign. here's our political correspondent, ben wright. it was a moment of national mourning. flags flying at half—mast in honour of prince philip, the duke of edinburgh. but inside number 10, on the evening of 16 april last year, two parties took place. there was drink and music at a time covid restrictions on indoor mixing in england were in place.

restrictions the queen followed at the funeral of her husband the following day. when i heard about this, iwas, of course, very, very concerned, and i understand that people across the country are angry about what has happened. earlier this week, the prime minister did apologise for mistakes that have been made. according to the daily telegraph, downing street staff were sent to a nearby shop with a suitcase to buy more booze. number 10 has not denied any of this. borisjohnson himself was not there. itjoins the list of events being investigated by sue gray, a senior civil servant. as well as the two parties on the same night in april last year, back in december 2020, we know of several gatherings — both in downing street and government departments — including one on december 18, about which the prime minister said this...

i have been repeatedly assured since these allegations emerged that there was no party and that no covid rules were broken. the list goes on with events in november 2020 being looked at. there was a gathering in the number 10 garden on may 15, 2020, and a bring—your—own—bottle event on the 20th, which borisjohnson has apologised for attending. today's chastened apology to the queen is the latest twist in a saga that has engulfed number 10. as new revelations have dripped out, downing street has appealed for patience, saying all the facts will be known when sue gray publishes her report. but many tory mps are livid about the prime minister's handling of all of this and the apparent culture inside number 10. even a government minister has said things must change. it's not acceptable behaviour. he's apologised — and quite right, too — and he needs to change his behaviour going forward, and we all, i think,

agree that. a handful of backbench conservatives have written letters to the parliamentary party, asking for a confidence vote in borisjohnson. sutton coldfield is a true blue seat in the west midlands. but last night, the officers of its conservative association voted unanimously to withdraw its support from mrjohnson. the constituency�*s mp is a former cabinet minister. reporter: are you asking for his resignation? i'm not. i'm not normally a letter writer, but i'm waiting to see what sue gray reports. it is of immense concern, and i'm very conscious in the local community, in royal sutton coldfield, people are aghast at what's been going on. here and across the country, tory mps will be sounding out their local parties and voters. i think it's disgusting. they're like a rudderless ship, really. i think it's a vendetta - that the media have got. opposition parties are now calling on borisjohnson to quit. the prime minister allowed this to happen in number 10 not once, not twice,

but on multiple occasions. the culture was it's one rule for everybody else and one rule for us. for a prime minister under intense pressure, much hangs on an inquiry that could lay bare whether those responsible for setting lockdown rules repeatedly broke them. ben wright at westminster. lawyers for virginia giuffre, who's accused the duke of york of sexual abuse, are calling for two people — based in the uk — to give evidence in her civil case, including his former equerry. prince andrew denies all the allegations. our correspondent in washington nomia iqbal gave me the details. one of the people that they are asking testimony from is a woman called shukri walker. this is a woman who claims to have seen prince andrew at a nightclub in london in 2001 with a girl, a young girl.

and ms giuffre contends that it was the same night, after that club, that the prince allegedly abused her. now, as you mentioned there, the second request is for testimony from his former assistant, major rob olney, and ms giuffre's lawyers believe that he may have some information relating to the relationship that prince andrew had with the convicted sex offender jeffrey epstein. now, prince andrew has, as we know, consistently denied the allegations, his team have said this legal case is a marathon, it's not a sprint, but he has run out of legal manoeuvres, virginia giuffre's team are clearly preparing for a court hearing here, they are at that stage where they're asking for all this evidence, and they haven't ruled out a settlement, although her team have said that if there is a settlement, it can't be purely financial. just explain the us process here, because they are calling for these depositions, aren't they, which is evidence under oath,

and there are some reports that that could even extend to prince andrew's ex—wife, fergie, and their daughters. potentially, it could. because sarah ferguson, the duchess, prince andrew's ex—wife, is quite crucial to prince andrew's story of what happened that night. sojust to remind people, when prince andrew gave his interview to the bbc two years ago, he has suggested that the night he was alleged to have carried out the offence against virginia giuffre, he was actually at a birthday party at a pizza restaurant. and i just want to quote to you what he said in the interview. he said that, "it couldn't have happened," what was being alleged, "because the date being suggested, "march10, i was at home with the children, and then "because the duchess was away we have a simple rule "in the family that when one is away, "the other is there." and virginia giuffre's team are throwing the kitchen sink at this — they said they intend to call everybody who was integral to that story to court. but it might not be that straightforward, because here in america,

you have subpoenas, and so a subpoena is given out and it's enforceable within america, so you are compelled to show up in court, and if you don't, then a us marshall is brought in to bring you to court. outside of the us, it's not enforceable, so, basically, if you're called, you can simply ignore it. and remember, that is one of the options that prince andrew potentially has, where he could default on this, he could ignore the court summons altogether, but he runs the huge risk of then it being ruled in his absence. and prince andrew's team has said, as i mentioned, that this is a marathon, not a sprint, they have said that they are prepared to defend his name. nomia iqbal reporting. washington and kyiv have accused russia of preparing to carry out "false sabotage operations" to create a "pretext" for an invasion of ukraine. the pentagon said moscow had sent a group of trained operatives into eastern ukraine. they could then carry out acts of sabotage against russia's own proxy forces there, which are concentrated

in the donetsk and luhansk regions. ukraine's defence ministry said russia was plotting to stage similar operations in the disputed moldovan region, known as transnistria, on the ukrainian border. the kremlin has denied the reports but the pentagon says its intelligence showed the plans were well under way. we do have information that indicates that russia is already working actively to create a pretext for a pot — for a potential invasion. and, again, we've seen this kind of thing before out of russia. when there isn't an actual crisis to suit their needs, they'll make one up, and so, we're watching for that. ukraine has also accused russia of being behind a large—scale cyber attack that hit numerous government websites. the nato secretary generaljens stoltenberg has condemned the cyber attack.

he said the alliance's experts had been in touch with their ukrainian counterparts on the issue. russia has also arrested members of the revil hacker group. revil were responsible for last year hack which disabled the us —— revil were responsible for last year's hack which disabled the us colonial pipeline. moscow said it was cracking down on the hackers at the request of the us. katerina sedova is a research fellow at georgetown�*s center for security and emerging technology, and has advised us department of defence on disinformation and cybersecurity. i asked whether there's a clear culprit behind the hack, given that the hackers wrote their messages in russian, ukrainian and polish. i will leave the attribution to the ukrainian authorities, since there is much to still be investigated, but the security

service of ukraine has already stated that certain indicators point to hackers associated with the russian security services. even without looking at the technical indicators, a few things stand out. russian actors have used this tactic before against both georgia and ukraine. the message was in russian, ukrainian and broken polish, as you indicated, and it also indicates the attempts to disguise themselves as polish nationalist actors. it also invoked historic grievances from contentious parts of polish—ukrainian relations — that is a narrative russian disinformation actors have previously used a lot to stoke tensions between these two very close allies. so even without attribution, there are signs that point at the actors affiliated with the russian state. how well—equipped is ukraine to deal with something like this? well, they are quite equipped to deal with defacement

of websites, even though there are some 70 government sites that appear — that may appear as targets of a massive cyber attack, it really isn't the same in class as the past attacks from the russian actors, such as those that took down the electric grid in 2015 and in 2016, or the attack that took down a lot of transportation and banking systems. so a lot of these websites are back up, no data has been stolen, and it appears to be more a case of an influence operation that essentially is using messages to intimidate ukrainians to, quote, "be afraid and expect the worst" and undermine their faith in the ukrainian government's ability to keep them safe. is it also perhaps a warning that they could do much worse? i mean, if they were to hit infrastructure

utilities, for example? of course. it is a reminder of what they had already done in the past. this is just a shot across the bow, so to speak, to remind ukrainians — that don't need a reminder — that they are under constant threat, that their utility grid, their electric grid can go down, that their banks, banking and transportation systems can go down. so, yes, it is, infact, a message to really intimidate and try and sow panic. thank you. katerina sedova. canadian scientists studying the impact of space travel on the human body say their findings may help develop treatments for chronic anaemia back on earth. the study of 1a astronauts who'd been on the international space station shows that 50% more red blood cells are destroyed in space than on earth. doctor guy trudel from the ottawa hospital research institute explains. we suspected something happened in the very first days in space, up to ten days, but

we found that the destruction continued on for the entire duration of the 6—month mission of these astronauts, and this high rate of destruction is not sustainable. so, we found also robust signs of an increased production of red blood cells to match the destruction so, unsuspected to us, we find there is a higher level of turnover, loss of red blood cells produced and destroyed, and that increased turnover is happening in the background and we did not know about that — that is one of the main findings of the study. and how did you get the samples with these astronauts? did it mean loads of blood tests or did you do that in a different way? ok, so we used some unique methods for that, and that involves collecting breath samples from astronauts. so, we sent to space a kit — a breath kit that the astronauts will prepare the day

before and the next morning, they will blow into a series of tubes and then transfer the air from a plastic bag into a metal canister, and that metal canister was sturdy enough to be sent back to earth and back to our lab for analysis. that is really fascinating. crosstalk. just a final question, if i may. what does this mean for months and years in space? so many people are talking about these really long missions now, hoping to get to mars and things. is this something that can be prevented, because presumably that would cause a lot of damage to astronauts' health? so far, for the six months that they are in space, we know they are balanced, so there is increased production and increased degradation — that's balanced. but the astronauts are living on their reserve, so we need that reserve in case there is a need for red blood cells — a bleed or something like that. so how long can that increased turnover take place is unknown.

doctor guy trudel. a 24—year—old american who specialises in stunts, such as reading every word in the pocket oxford dictionary in one sitting, has topped the annual list of the world's highest—paid youtube stars. jimmy donaldson, who's known as �*mr beast�*, made almost $54 million last year and generated more than 10 billion views. here's our gaming reporter, steffan powell. we created every single set from squid game in real life... this might be the first time you've ever heard the name jimmy donaldson. on youtube, though, he's kind of a big deal. 30 people have gotten out... his highly produced elaborate stunts, like playing hide and seek in a sports stadium or recreating netflix's show squid game, have earned him the top spot. his income is just above that of f1 champion lewis hamilton. while traditional media struggled during the pandemic,

tv production were suspended and film releases delayed, youtube was booming. the top—ten highest paid creators on the platform earned a combined £219 million in 2021 — that's an increase of a0%. youtubers like jake paul haven't made the listjust because of their popularity. they've been the ones to cash in most effectively with brand partnerships, sponsorships and merchandise. despite this success, though, it's not all rosy, according to some. it was surprising to see how many white men were on the list. youtube is a really global environment, we know that it's hugely popular around the world, and it seemed like we didn't see anybody outside of the english—speaking world there, and i think that is something that youtube really needs to work on in the future, to make sure that people outside of these countries are compensated fairly for their work.

there's still space for ten—year—old toy reviewer ryan kaji. the number one from 2019 and 2020 has, though, slipped to seventh place on the list, having earned a paltry £20 million. steffan powell, bbc news. it's worth thinking about, isn't it? now some lovely pictures. now to a rare spot of nature drawing crowds in the heart of washington. here you can see, at the top of your screen, an arctic snowy owl perched on washington's union station. but is obviously someone taking a photograph of it! —— that is obviously someone taking a photograph of it! birdwatchers flocked to catch a glimpse of the rare bird of prey in an urban setting. again, that is not it. there you go. on the top. not sure if it has a name yet. these snowy owls spend most of the year living in the arctic circle and migrate south to the us and canada for winter

but are a rare sight in the us capital. an ice opportunity. plenty more on the novak djokovic latest developments coming up. —— a nice opportunity. hello there. another cold night, certainly, for england and wales. widespread frost and also some mist and fog reforming. some of it will be quite dense in places to start this morning but most of the country this weekend will be dry and settled. there will be some showers around, though, as a weak front spreads its way across the uk. here it is out west in the atlantic for saturday. but you can see it's higher pressure towards the south and the east of the country. lightish winds again through the morning, so that means we will start off rather cloudy, misty, murky. some fog around too. most of that fog lifting into low cloud through the day, so quite a bit of grey weather, ithink, around. but there will be some sunshine around, the best of it in northern england, into northern and eastern scotland, northern ireland as well into the afternoon, perhaps south west england too. temperatures, 5—9

degrees for most of us. more of a breeze coming up from the south—west, so that means the air quality should be a bit better for london and the south—east. now, as we head through saturday night, most places will be dry, bar the odd shower around. further north, we've got that weather front spreading down from the north. that'll bring a band of cloud and rain, some blustery showers following in behind there. and temperatures, 1—4 degrees across the board, so not quite as cold as what we've had the last few nights. as we head on into sunday, we've got that weak cold front spreading southwards across england and wales. there will be barely anything on it, so a band of cloud, just some spots of rain slowly pushing southwards. behind it, skies will brighten up, but it will be a breezy day right across the board. there are more isobars on the pressure chart. even windy across the north of scotland, with gales in the northern isles. temperature—wise, pretty much where we should be looking at this time of year, ranging from around 7—9 degrees. we could see 10 or 11 degrees across southern england and south wales.

now, as we move out of sunday into monday, that weather front clears away and then high pressure builds back in it once again. that'll settle things down, notjust for monday, for the rest of the week, so it could be quite a chilly start again for monday. light winds for most, apart from northern and western scotland. there will be a bit more cloud here, a bit more of a breeze and temperatures again around the seasonal average — range from around 6—9 celsius. now, apart from a few weather fronts across the north of the uk as we move through this new week — that could bring a few showers across the north — most places will be dry and settled, thanks to that area of high pressure, but signs of it turning a little bit chillier towards the end of the week.

this is bbc news, the headlines: the world tennis number one novak djokovic has been returned to the same melbourne detention centre where he was first held, as his lawyers continue to challenge his latest visa cancellation. the australian government is arguing that his continued presence in the country is undermining their covid vaccine strategy. washington and kyiv have accused russia of preparing to carry out "false sabotage operations" to create a pretext for an invasion of ukraine. the kremlin has denied the reports, but the pentagon says its intelligence showed the plans were well under way. one of borisjohnson�*s ministers has called his behaviour "unacceptable", after downing street apologised to the queen for number 10 staff lockdown parties on the eve of prince philip's funeral. the prime minister didn't attend either party

business leaders are urging the government to lift the work—from—home guidance in england.