Back to france. laughter he is the billionaire creator of chobani yogurt, and a reminder that foreigners dont always take jobs from americans, sometimes they create them a lot of them. Hey, brother, how you doing . There arent many jobs as dangerous as a gorilla doctor. And as we learned firsthand, before getting close enough to treat one. About to give the antibiotic. These veterinarians often travel miles and miles into some of the most difficult terrain on earth. Im steve kroft. Im lesley stahl. Im bill whitaker. Im anderson cooper. Im lara logan. Im scott pelley. Those stories, tonight on 60 minutes. Cbs money watch update, sponsored by lincoln unanimous,. Youre in charge. Reporter good evening. Terror lance weeks brexit vote are expected to be topics of conversation. Cutting costs. And the estate with Debbie Reynolds and Carrie Fisher lived for 18 million. Im demarco morgan. Cbs news. Thats life. You diet. You exercise. And if you still need help lowering your blood sugar. 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Stahl questions continue to swirl around the kremlins possible role in our president ial election, and the nature of contacts between the russians and those close to President Donald Trump who has repeatedly professed his admiration of Vladimir Putins skills as a strong leader. But as we first reported in march, what mr. Trump doesnt talk about is the unfortunate fate that stalks some of putins most prominent critics. They have been victims of unsolved shootings, suspicious suicides and poisonings. Tonight, the story of one of them. Vladimir karamurza was an opposition activist on the front lines, protesting putins policies, organizing demonstrations and town hall meetings. He knew he was on a dangerous mission. When we met him last year, he told us that one day in may, 2015, he learned just how dangerous. Vladimir karamurza i was in a work meeting with my colleagues in moscow, when i suddenly started to feel really sick. And i went, within about 20 minutes, from feeling completely normal to feeling like a very sick man. Then, i dont remember anything for the next month. Stahl you were out for a month . Vladimir karamurza i was in a coma for a week, and i dont remember anything for a month, and had basically a cascade of all my major life organs failing, one after another; just switching off, you know, the lungs, the heart, the kidneys. Stahl he was shuttled from hospital to hospital in moscow for two days, as doctors frantically tried to figure out what was wrong with him. Vladimir karamurza i was, at one point, connected, i think to eight different Artificial Life support machines, and doctors told my wife that theres only going to be about a 5 chance that ill survive. Stahl but he beat the odds. When we spoke with him last year, hed been recovering for a year, but he was still walking with a limp from nerve damage. So what happened . Vladimir karamurza well, it was some kind of a very strong toxin. We dont know what it was because, you know, with these things, as people who know more about this than i do explained to me, you basically have to know exactly what youre testing for in order to find it. Stahl so they never found the exact compound . Vladimir karamurza they never did. Stahl it wasnt until the fourth day, and after he had been on a dialysis machine, that blood was drawn and sent to a Toxicology Lab in france. It found heavy metals in his blood, but no specific toxin. Still, karamurza maintains that he was poisoned. Vladimir karamurza i have absolutely no doubt that this was a deliberate poisoning, that it was intended to kill. Because, as i mentioned already, the doctors told my wife that its about a 5 chance of survival. And when its that kind of percentage, its not to scare. Its to kill. Stahl can you be sure that what happened to you was directed by mr. Putin . Vladimir karamurza well, of that we have no idea. I dont know the precise circumstances, i dont know the who or the how, but i do know the why. Stahl in recent years, quite a few of putins enemies have perished by swallowing things they shouldnt have. In 2006, russianspyturned kremlincritic Alexander Litvinenko drank tea laced with polonium210. Two years earlier, the ukrainian politician Viktor Yushchenko had somehow ingested dioxin. He survived, but was disfigured. But what would the motive be in the case of the critic Vladimir Karamurza . Cambridge educated, he was for years a washingtonbased reporter for a russian tv station. So he was wellconnected and had perfect english, which he used to incessantly criticize the regime on the international stage. Vladimir karamurza a government that is based on genuine support does not need to jail its opponents. Stahl as if his outspokenness wasnt enough to anger the kremlin, he made matters worse for himself when he joined forces with this man. Bill browder its death if you cross the putin regime. Stahl bill browder was for years the largest foreign investor in russia and putins champion, but he turned into a dogged adversary when his russian tax attorney Sergei Magnitsky blew the whistle on alleged largescale theft by government officials. Browder we discovered massive corruption of the putin regime. Sergei exposed it, testified against officials involved. He was subsequently arrested, put in pretrial detention, tortured for 358 days and killed at the age of 37. Stahl browder was so outraged, he joined with Vladimir Karamurza to lobby the u. S. Congress for a law targeting those responsible for that death and other human rights violations. They succeeded the magnitsky act passed in 2012. It is the first law that sanctions individual russians, 44 so far. Browder the magnitsky act is designed to sanction, to freeze the assets and to ban the visas for people who commit these types of crimes in russia. Stahl so they cant get their money, which may be stashed in the united states. Browder and so Vladimir Putin is extremely angry that the magnitsky was going to be passed. He was even angrier when it got passed. And he was angrier when people started getting added, names started getting added to the magnitsky list. Stahl one reason Vladimir Karamurza is convinced he was targeted is because six people connected to the magnitsky case, as he was, have ended up dead. One of them was boris nemtsov, a leader of russias opposition and karamurzas partner in lobbying for the magnitsky act. Vladimir karamurza on the 27th of february 2015, he was killed by five bullets in the back as he was walking home, as he always did, out in the open, without bodyguards stahl this was an assassination. In some of the deaths, proving there was foul play has been a challenge. Take the case of this russian banker, who came forward with incriminating documents related to the magnitsky case. Browder Alexander Perepilichny was a whistleblower. At the age of 44, he went jogging outside his home in surrey, outside of london and dropped dead. The police deemed it an unsuspicious, natural death. Stahl well, they did look for poison. They just couldnt find any. Browder they did a very firstround toxicology screen. They didnt find anything on the first run through. Stahl detecting poison can be extremely difficult, and theres a reason this cold war c. I. A. Memo reveals that the soviets ran a laboratory for poisons in a large and super secret installation known as the chamber to test undetectable compounds. In the case of the banker in london, the coroner wasnt willing to give up. He ordered more tests, and three years later it was revealed in court that an exotic toxin was found, with the help of an authority on flowers. Browder a small sample of his stomach contents was sent to a Botanical Garden outside of london, and one of the scientists found a compound called gelsemium elegans, which is a chinese herb. They call it the heartbreak grass, and it causes a person to die unexpectedly without explanation. Stahl still, theres no direct evidence of a kremlin connection, but the list of those whove come to die unexpectedly after running afoul of mr. Putin is long. Political opponents and human rights lawyers have been shot; overlyinquisitive reporters have perished in mysterious plane crashes or by car bombs, by poison or gunfire. Journalist Anna Politkovskaya was poisoned and shot. Then there are enemies who kill themselves, one by hanging, one by stabbing himself to death with two knives, and one by tying himself to a chair and jumping into a swimming pool. Some of putins opponents are in prison, others forced out of the country, like mikhail khodorkovsky, probably putins most famous living critic. Are you afraid for your own life . Mikhail khodorkovsky translated for a period of over ten years, Vladimir Putin had ample opportunity to put an end to my life in a very easy way, just by snapping his fingers. And today, its a little more difficult. Stahl khodorkovsky was once the richest man in russia, until he took to opposing putin. He was put on trial, his oil company confiscated, and then thrown in prison for ten years. Home is now london, where he funds a russian prodemocracy movement and this is where the plot thickens because one of his senior organizers on the ground in russia is none other than Vladimir Karamurza. There are people who say that whats happened to karamurza is a message to you, a message to you to back off. Khodorkovsky translated you know, for ten years, i was receiving lots of messages from our authorities of various sorts. And some of these messages were rather unpleasant, concerning my physical well being. But the authorities saw i ignored these messages. I would like to believe that they have not forgotten that. Stahl in 2015, once Vladimir Karamurza was stabilized, he was flown to washington d. C. To continue treatment near his wife, yevgenia, and their three children, who live in the u. S. For their safety. But as soon as karamurza got better, he was itching to go back to russia. Yevgenia karamurza i think what my husband believes in will always outweigh the fear. Stahl even for you . Yevgenia karamurza of course im terrified. But at the same time, you know, i married the guy 13 years ago, and i knew what i was getting into. Vladimir karamurza you know, i think theres Nothing Better this regime, the putin regime would like us to do than to give up and run away. And were not going to give him that pleasure. Its our country. Stahl even after being poisoned . Vladimir karamurza its our country. We have to fight for it. Stahl he told us this last june. He went back immediately after, even though threats against him had intensified, like this video posted on instagram putting him in the crosshairs of a sniper rifle. He was continuing his opposition work, when this past february yevgenia karamurza all of a sudden, he begins experiencing this very elevated heart rate, his Blood Pressure drops very low. He begins sweating and he has trouble breathing. Stahl his wife thinks her husband was attacked, the same way as before. Yevgenia karamurza the first time, he had been dragged from one hospital to another to yet another, where they were trying to establish the cause. This time, he was taken directly to the hospital, to the same medical team that had treated him in 2015. And the moment they saw him, they knew what they were dealing with. Stahl and what do you think happened . Yevgenia karamurza the russian doctors official diagnosis is an acute intoxication by an undetermined substance, which is poisoning. Stahl this happened just as washington was raising questions about president trumps relationship with mr. Putin. So, vlaidmir karamurza quickly became an issue on the senate floor. John mccain vladimir has once again paid the price for his gallantry and integrity. Stahl politicians on both sides of the aisle spoke out against the apparent poisoning, but the Trump Administration has not. Remarkably, karamurza survived again. Less than three weeks after he collapsed, he was flown to the u. S. , and two weeks later, we spoke to him for a second time. You look pretty good. How are you actually feeling . Vladimir karamurza well, youre very kind. I dont think i feel as good as i look. Stahl he said hes recovering faster because his doctors knew just what to do this time. The kremlin has denied any involvement, and since no poison has been found yet, supporters of putin question whether he was really poisoned at all. Weve been told that we are very naive, naive journalists, gullible, and that this whole thing is concocted by the opposition to fool the American People into thinking that that regime would do such a thing. Vladimir karamurza to those who say that this is a plot, i honestly and i mean this sincerely i wish they never have to experience what ive experienced twice in the last two years, when youre trying to breathe and you cannot. When you feel your organs shutting down, giving up on you one after another. And when you feel the life coming out of your body in the next few hours, and you dont remember anything for the next month. And then for the next year youre trying to r relearn how to walk, how to use cutlery, you know, how to talk to your kids again. I wish these people who tell you these things never have to experience this. I honestly, sincerely do. Stahl you were very, very sick and went back. Now, are you finished . Are you saying, im not going back any Vladimir Karamurza oh, god no, of course not. Stahl youre going to go back . Vladimir karamurza of course, i will absolutely go back to russia. I am russian, this is my country, and i believe in what i do, in what my colleagues do. There are many of us. Stahl but not many have almost died twice. Vladimir karamurza many, unfortunately, have died. Im the fortunate one. Im still here, im still talking to you. Many of my colleagues cannot do that. If he was poisoned twice, why isnt he dead . The search for an answer at 60minutesovertime. Com. The sunll come out tomorrow. For people with Heart Failure, tomorrow is not a given. But entresto is a medicine that helps make more tomorrows possible. Tomorrow, tomorrow. I love ya, tomorrow in the largest Heart Failure study ever, entresto helped more people stay alive and out of the hospital than a leading Heart Failure medicine. Women who are pregnant must not take entresto. 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