Question: What type of details about boris berezovsky -lrb- businessman -rrb- can be gathered from the following bio? Bio: boris abramovich berezovsky -lrb- , 23 january 1946 -- 23 march 2013 -rrb- was a russian business oligarch , government official and mathematician . he was a member of the russian academy of sciences . berezovsky was politically opposed to the president of russia vladimir putin , since putin 's election in 2000 and remained a vocal critic of putin for the rest of his life . in late 2000 , after the russian deputy prosecutor general demanded that berezovsky appear for questioning , he did not return from abroad and moved to the uk , which granted him political asylum in 2003 . in russia he was later convicted '' in absentia '' of fraud and embezzlement . the first charges were brought during primakov 's government in 1999 . despite an interpol red notice for berezovsky 's arrest , russia repeatedly failed to obtain the extradition of berezovsky from britain , which became a major point of diplomatic tension between the two countries . berezovsky made his fortune in russia in the 1990s when the country went through privatization of state property he profited from gaining control over various assets , including the country 's main television channel , channel one . in 1997 forbes magazine estimated berezovsky 's wealth at us$ 3 billion . he was at the height of his power in the later yeltsin years , when he was deputy secretary of russia 's security council , a friend of boris yeltsin 's influential daughter tatyana , and a member of the yeltsin '' family '' -lrb- inner circle -rrb- . berezovsky helped fund unity -- the political party , which formed vladimir putin 's parliamentary base , and was elected to the duma on putin 's slate . however , following the russian presidential election in march 2000 , berezovsky went into opposition and resigned from the duma . after he moved to britain , the government took over his television assets , and he divested from other russian holdings . in 2012 , berezovsky lost a london high court case he brought over the ownership of sibneft against roman abramovich , in which...
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