Mr Maskhadov's people say that only a handful of Chechens, if any, are fighting in Afghanistan.
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The Chechens became famous for their warrior prowess, the Dagestanis for their Koranic learning.
The overwhelming majority of Turks and Chechens are Muslims, and more than 20, 000 Chechens live in Turkey.
Libyans and other Arabs have been spotted, along with smaller numbers of British Muslims, Pakistanis and Chechens.
The Tsarnaevs are ethnic Chechens from the troubled Caucasus region of southern Russia.
The two met in Boston, where Todashev had lived and where there is a small, close-knit community of Chechens, said Taramov.
Law enforcement officials and family members have identified the brothers as ethnic Chechens who had lived in Dagestan, in southern Russia.
Two of the arrested Chechens, Musa Vakhayev and Kazbek Dukuzov, are accused of carrying out the killing at Mr. Nukhaev's behest.
Russian prosecutors charged three Chechens it claimed were gunmen hired by warlord Khozh-Akhmed Nukhaev, the subject of one of Klebnikov's two biographies.
The Tsarnaev family are ethnic Chechens but have lived mostly outside Chechnya.
The distinctiveness of the Chechens is the most notable fact about them.
Todashev had lived on and off with other Chechens in the Orlando suburb of Kissimmee and had moved to Orlando more recently, friends said.
The two met a couple years ago in Boston, where Todashev had lived and where there is a small, close-knit community of Chechens, said Taramov.
He hardly ever saw the two Chechens talking to each other.
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The brothers are ethnic Chechens who lived in Kyrgyzstan and Dagestan.
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On the ground, though, Chechens say that the Georgians have quietly given them the nod, and a Georgian construction company is working on the road.
Reinares said Spanish security services have established that both Chechens received motor-paragliding lessons near La Linea and may have had some instruction before arriving in Spain.
Investigators moved to arrest all three men after the two Chechens appeared to be heading back to France by bus, concerned that France may be their target.
As well as strong family loyalties, part of the glue that held the Chechens and other north Caucasian people together was Sufism, the mystical strand of Islam.
Tsarnaev's uncle Ruslan Tsarni -- who has said his nephews had brought shame on the family and all Chechens -- claimed his body, according to a family spokeswoman.
Russian troops had taken the town weeks ago, but Chechens attacked it and several others simultaneously on Sunday, and Russian troops had to fight hard to regain control.
By contrast, more than 100, 000 Chechens have settled in Europe.
Under intense pressure from the U.S. Embassy, the Russians charged a group of Chechens with the crime and a closed trial began last month in the Moscow city court.
Though he is ethnically Chechen, Anzor Tsarnaev grew up in the former Soviet republic of Kyrgyzstan because his parents were deported there in the Stalin era alongside many other ethnic Chechens.
According to a statement released Sunday from Ruz, the Chechens hid their true identity after they were arrested, but Spanish authorities were able to establish their real names after help from Russian authorities.
Mr Kadyrov has already won the upper hand here - now it is a question of whether his lightning-fast, sometimes unpredictable and often tough decisions, will bring the peace and stability which Chechens need so badly.
Prosecutors have asked to be allowed to hold the Chechens for two more days to allow police to root out more evidence in their investigation, partly because certain intelligence exchanges are not considered admissible in court.
Facility directors, she says, have now been warned to expect Chechens driving up to the gates and trying to bash their way through, and Russia is also heeding American requests to concentrate the most dangerous nuclear materials in fewer sites.
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