The World Health Organization says the pandemic could be over in two years could volunteers choosing to get infected play a part. Hello and welcome to bbc news. We start in russia where an hour ago a german air ambulance carrying russian Opposition LeaderAlexei Navalny took off from russias omsk airport. It is heading to berlin where hes to receive treatment there after falling into a coma. His supporters say he was intentionally poisoned and theyve accused the kremlin of trying to cover it up. Sarah rainsford looks back at the days events. She spent all day battling for her husband. Convinced Alexei Navalny has been poisoned, yulia wants him moved abroad. Away from a siberian hospital that is bristling with plainclothes security. Translation this situation is outrageous. Its clear they are hiding something. We demand that the hospital release alexei to us immediately, so we can take him to doctors we trust. Alexei navalny collapsed on a flight to moscow, carried off in a coma after an emergency landing. Crooks and thieves, is what he calls those in power here. Mr navalny is russias loudest voice of opposition and his forensic Anti Corruption investigations are hated by those they target. Today, his russian doctor suggested there could be an innocent explanation. Not poison, but low blood sugar, perhaps. His family are not chancing it. An air ambulance was flown in, and when the german medics on board finally saw mr navalny, theyjudged him stable enough to leave. So the russian team have done a u turn, earning themselves a round of relieved applause. Alexei navalny remains critically ill tonight, still unconscious, but his family hope a foreign clinic can give them some clearer answers. Sarah rainsford, bbc news, moscow. In california, lightning strikes over the past 2a hours have ignited several hundred more wildfires, including some of the biggest ever seen in the state. Six people have died and at least 175,000 residents have now been forced to flee their homes. The coronavirus pandemic is complicating efforts to fight the wildfires. Sophie long has more from los angeles. Vast infernos blaze throughout northern california, claiming at least five lives, destroying hundreds of buildings and an area bigger than los angeles. Copy, were going in now. Satellite images show the smoke cloaking most of california creating the worst air quality on the planet at a time when people are fighting a respiratory pandemic. And yet, this is political. But there are massive fires again in california. Maybe were just going to have to make them pay for it because they dont listen to us. We say, you got to get rid of the leaves, you got to get rid of the debris, you got to get rid of the fallen trees. But most of the blazes were sparked by whats being called a trifecta of fire conditions. A freak summer lightning storm, the most intense for more than a decade, collided with a heat wave recording record temperatures, and the resulting flames fanned by high winds. If you are in denial about climate change, come to california. 11,000 dry lightning strikes we had over a 72 hour period leading to this unprecedented challenge. California is no stranger to scenes like this but the ferocity of these fires so early in the season has astonished many of the thousands fighting them on the front line. Temperatures are expected to ease but the fires are now generating so much heat, they are creating their own winds pushing them in multiple unpredictable directions, threatening tens of thousands of homes. Sophie long, bbc news, los angeles. To the situation in belarus, where Opposition Leader svetla na tikhanovskaya has called on her supporters to step up their strikes at factories across the country, to try to force new president ial elections. Belarus is facing its biggest political crisis since the breakup of the soviet union, with tens of thousands of demonstrators saying veteran leader alexander lu kashenkos re election on the 9th of august was rigged. In the latest protest against lu kashenko, activists formed a human chain across the capital minsk. Ms tikhanovskaya has been speaking exclusively to our europe correspondent Jean Mackenzie in lithuania. The woman many think shouldve been crowned president of belarus. A woman who never even wanted to be a politician breaking cover for the First Time Since being forced into exile. She now leads the opposition from afar. And when we sit down with her, that reluctant sense of duty still shows. I just cant step away now, you know, because i became like a symbol of freedom. I understand that im not a leader. Im more frightened than anybody else among them. What frightens you 7 im afraid that maybe i will not be able to do enough. I dont know, itsjust a fear of responsibility. This was the moment she disappeared, the day after the election when long time president lukashenko declared himself the victor. When she emerged in lithuania, she hinted at a terrible choice shed had to make to keep her children safe. Can you tell me anything about what happened in those election offices and what choice you were given . Im sorry, but i cant. Not now. Bela russians have ta ken to the streets like never before, to show they voted for tsikhanouskaya and are ready for change. Enough is enough, was her message for the regime today. Enough lying, intimidation and violence. The past weeks have seen protesters detained and badly beaten. How do you feel when you see the reports of violence that have come out of the country in the last week . You know. I was really shocked. I didnt tell anybody, but i couldnt find peace, i was just crying. After a couple of hours, when we saw the first pictures, i cant imagine that belarussian people can be so cruel. With protests and strikes nearly into the third become Alexander Lukashenko shows no sign backing down. Are you worried that the movement could fail . No, im not worried because i believe in belarussian people the same way they believed in me. We have no right to step back now because if not now, we will be slaves. And our people understand this, and im sure we will stand till the end. That end for her is new elections, ones that are free and fair. Only then, she tells us, will bela russians know who their president truly is. Jean mackenzie, bbc news. Arrivals to the uk from croatia, austria and trinidad and tobago have been added to the list of travellers who will have to self isolate for two weeks once they touch down in the uk, because of a rise in infections in those countries. The rule came in to effectjust minutes ago and led to a mad dash for british holiday makers to get back in time to avoid the quarantine. Our europe correspondent gavin lee met some of them in croatia. A late Summer Getaway on croatias dalmatian coast, where there are more british holiday makers than from any other country. 17,000 uk tourists are here at the moment. For many, the break is now over just as it was beginning. Theyre leaving before mandatory quarantine rules kick in. Im a teacher, so if i dont go back today, i miss being back at school, and the kids have been off for six months. Were both key workers in england, so weve had to pay an extra £400 for a flight home which leaves in two hours time. So, were heading there now. Further up the coast in the harbour of sibenik, a group of students from Nottingham TrentUniversity Say they need to be back for the start of term, but they cant afford the ticket prices. We obviously dont have that much money saved up to get a flight home because of the inflation of prices. We are just really stuck here. Weve all got part time jobs as well, its slightly annoying, because now we have to take time off of work, so we dont get any money to save up for uni. So whats going wrong in croatia . Back in may and june, this country of 5 Million People barely registered a single case a day. In the past week, there has been a notable rise 265 cases in the past 2a hours. Other eu countries are attributing clusters of new cases to tourists coming back from here. The countrys secretary of state for tourism said the british decision was unfair but acknowledged there is a problem. It is true that we have several hotspots in croatia in recent days, but they are the result of non compliance with the epidemiological measures. Mostly, its younger people in some nightclubs and other gatherings. But the uk isnt the only country to add croatia to the quarantine list. There are four other countries this week, and its here in split, where theree concern that its the epicentre, that people arent listening to social distancing advice, and thats why its become a problem here. Tonight, this was the last uk bound flight out of the country. A frantic day almost at an end for those getting back in time. For others, thinking ofjetting off for a late break elsewhere, the official advice is be prepared to unexpectedly have to quarantine. Gavin lee, bbc news, split on the dalmatian coast. Stay with us on bbc news, still to come swifts gift why a london student is celebrating her taylor made donation. Washington, the worlds most political city, is today assessing the Political Health of the worlds most powerful man. Indeed, i did have a relationship with miss lewinsky that was not appropriate. In fact, it was wrong. In south africa, 97 people have been killed today in one of the worst days of violence between rival black groups. Over the last ten days, 500 have died. Czechoslovakia must be free. Russia is observing a national day of mourning for the 118 sub mariners who died on board the kursk. We are all with them now, within our hearts. The pope has celebrated mass before a congregation of more than 2. 5 Million People in his hometown of krakow. Stay with us chanted this ocean of humanity. Well, well, joked the pope, so you want me to desert rome . This is bbc news, the latest headlines a german air ambulance carrying russian Opposition LeaderAlexei Navalny has taken off from russias omsk airport. It is heading to berlin where hes to receive treatment there after falling into a coma. New coronavirus quarantine restrictions have come into force in the uk. Anyone arriving from croatia, austria, or trinidad and tobago, will have to self isolate for two weeks. The head of the World Health Organisation says he hopes the Coronavirus Crisis can be over in less than two years. The comments by Tedros Adhanom ghebreyesus come as cases of the disease continue to surge in europe. France, spain, italy and germany have recorded their highest numbers of daily cases since the spring. We have a disadvantage of globalisation, closeness, connectedness, but an advantage of better technology. So we hope to finish this pandemic before, less than two years. Especially if we can pull our efforts together with global unity and solidarity, thats really key. With utilising the available tools to the maximum and hoping that we can have additional tools like a vaccine, i think we can finish it in a shorter time than the 1918 flu. The head of the World Health Organization there and his comments come as Scientists Say it could be many months before we know if any of the 30 or so coronavirus vaccines currently undergoing trials, are effective. But one way to speed up the process would be to use so called challenge trials where volunteers are given the vaccine and then deliberately infected with coronavirus. Heres our medical editor, fergus walsh. The longer we go without a vaccine, the longer people will die unnecessarily. Young, healthy and determined. Sean mcpartlin is 22 and studying in oxford. He keeps fit by swimming in the thames. I volunteered to be infected with the coronavirus. Sean wants to take part in a so called challenge trial, where he would first receive a vaccine against covid 19 and then be deliberately infected with coronavirus, to see if the vaccine protects him. My mother has a hereditary lung disorder, and every day we go without a vaccine is a day where she faces a risk that she might not have to. So i want to do everything i can to help get that vaccine to her and everyone else like her as quickly as possible. The only way well know if a Covid Vaccine works is if volunteers later get exposed to the virus. But at the moment, thats being left entirely to chance. It could take months. Deliberately infecting volunteers could speed things up. One day sooner is a group campaigning for vaccine challenge trials and it has the support of 15 nobel Prize Winners and many leading scientists. Dominic wilkinson is an expert in medical ethics and an intensive care doctor. If you look at whats at stake, that thousands of lives that might be saved if we could get to a vaccine sooner, there is an ethical imperative to investigate and conduct challenge studies. A safe and effective vaccine against coronavirus is probably the only way our lives, our society, the economy, will return to normal. So anything that can speed up its delivery has to be worth considering. But what about the risks of challenge trials . They are hard to calculate. But for Healthy Volunteers in their 20s, they are probably lower than the chances of dying from donating a kidney or having your appendix removed. Dr katrina pollock is not convinced at least not yet. Shes running the trial of Imperial College londons coronavirus vaccine. Im not sure that its going to necessarily accelerate development of the vaccine in a way that some people might hope. And there are certainly significant, at this point, ethical and safety considerations for doing it. We need a lot more understanding of this disease before we start thinking about those kind of studies. If coronavirus challenge studies do you ever take place, volunteers would need to spend at least two weeks in quarantine at a Clinical Research unit. There are plenty like sean who are ready to sign up, hoping to play their part in the search for a vaccine. Fergus walsh, bbc news. In california, a mass murderer known as the golden state killer, has been sentenced to life in prison. 74 year old joseph de angelo murdered at least 13 people while working as a Police Officer in california in the 1970s and 1980s. He was only caught by a quirk of modern technology and earlier was sentenced to spend the rest of his life in prison. A plea deal spared him the death penalty. Earlier, i asked our north american reporter, regan morris, about his victims there were so many that their families couldnt all fit inside a court room. Thats right, he was sentenced inside a University Ballroom and coronavirus had something to do with that, because people had to be safely distanced. But there were dozens of people there, nowhere near the number that were impacted by this man, but they sat together as families and some of them gave impact statements, talking about his crimes, what the effect was on their families and he was sentenced right there in that courtroom. And he did apologise. He was in a wheelchair. He took off his mask and he told them, im truly, truly sorry. Why did it take so long then for him to be caught, convicted and sentenced . Well, he was a Police Officer and during the 70s, some actually speculated that they thought that maybe it was a Police Officer, because he always seemed one step ahead of investigators. He knew what he was doing. He was actually fired in 1979 for shoplifting, so he stopped being a Police Officer and thats when he moved from the north of california down to the south, and thats when his crime spree really widened. But they found him with this very unusual the first time in the United States this has happened, where the detectives uploaded some dna from a cold case and they matched it to some members of his family. They narrowed it down and it was just on a genealogy website, it wasnt through some database of criminals. It was through a genealogy website, so they were able to link him to his family and eventually they were able to identify him as the golden state killer. Let s get some of the as the golden state killer. The United States and the European Union have announced their first mutual trade tariff reductions in more than two decades. The deal will increase Market Access for hundreds of millions of dollars of us and eu exports, ranging from american lobster products to european glassware. Volunteers in mauritius say the government is blocking efforts to help clean up a recent oil spill. The Authorities Say the area has been restricted for health reasons. But there s concern the government is trying to silence criticism of its handling of the spill. Us Actress Lori Loughlin has been sentenced to two months injailfor her part in a College Admissions scam. Along with other wealthy parents, she paid bribes so her children could get into top universities as fake athletic recruits. More than 50 people are facing charges over the scheme. The captain of Manchester United football club, Harry Maguire, has been arrested while on holiday on the greek island of mykonos. Hes due to appear in court later this morning. Our Sports Correspondent olly foster has the details. Yes, the worlds most expensive defender is spending a second night in a greek police cell. The club this morning confirming that their captain was fully cooperating with the greek authorities. We know that Harry Maguire and two other british men were arrested at around midnight last ni