Chechenseparatists later claimed responsibility for the operation, on their Internet website.
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Russia has fought two wars against Chechenseparatists since the early 1990s.
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Russia believes insurgents linked to Chechenseparatists are hiding in the region.
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Some 25 Chechenseparatists had also died in the fighting, he said.
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Russia has fought two wars against Chechenseparatists since the mid-1990s.
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Putin puts the blame for Friday's attack firmly on Chechenseparatists.
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Russia has been beset by concerns over terrorism since the wars with Chechenseparatists of the 1990s.
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The Kremlin had declared victory in its battle with Chechenseparatists who fought two wars with Moscow.
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The bomb went off in Moscow's busiest underground street crossing and was initially blamed on Chechenseparatists.
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CHECHENseparatists reported that Russian forces had launched a major offensive on their positions in Grozny late yesterday.
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Chechenseparatists and the Georgian and Estonian governments have been high-profile victims of similar attacks in the past.
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Mr Zakayev was arrested and briefly detained in Poland last week while attending a meeting of Chechenseparatists.
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But Chechenseparatists in exile disagreed.
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Russia has fought two wars in the region against Chechenseparatists since the 1991 fall of the Soviet Union.
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CORRECTION: This column has been updated to remove a reference to a series of 1999 bombings attributed to Chechenseparatists.
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Acting President Vladimir Putin's main spokesman on the conflict, Mr Sergei Yastrzhembsky, said Russia would undertake no new negotiations with Chechenseparatists.