Answer the following question: What type of details about dokka umarov can be gathered from the following bio? Bio: doku khamatovich umarov -lrb- ; ; also known as dokka umarov as well as by his arabized name of dokka abu usman ; 13 april 1964 -- 7 september 2013 -rrb- was a chechen islamist militant in russia . umarov was a major military figure in both recent wars in chechnya during the 1990s and 2000s , before becoming the leader of the greater insurgency in the north caucasus . he was active mostly in south-western chechnya , near and across the borders with ingushetia and georgia . during the late 1990s , after chechnya 's first war against russia , movladi udugov 's status as war hero enabled him to take the post of the breakaway republic 's security minister . between 2006 and 2007 , following the death of his predecessor sheikh abdul halim , umarov became the underground president of ichkeria of the unrecognized government of the chechen republic of ichkeria , the post that umarov eventually abolished himself when he renounced and abandoned chechen nationalism in favour of regional pan-islamism and jihadist ideology . the political mantle of chechen nationalist separatism was formally taken over by the self-exiled akhmed zakayev , umarov 's former wartime comrade and friend turned political rival . having quit the position of chechen separatist leader , umarov subsequently became the self-proclaimed emir of the entire north caucasus region of russia , declaring it a putative islamic state of the caucasus emirate . in 2010 , umarov abortively resigned position and appointed aslambek vadalov as the new emir of the caucasus emirate , but soon afterwards issued a statement annulling the previous declaration and stating he would remain in his position and rebel sharia court ruled in favour of umarov over the rift , following which most other russian rebel leaders re-swore allegiance to him . for years , umarov had been the top terrorist leader in russia , and taken responsibility for several attacks on civilian targets since 2009 , including the 2010 moscow metro bombings and the 2011 domodedovo international airport...
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