Armen Sargsyan, the leader of the "Arbat" battalion, was severely injured following a blast in the entrance hall of a residential building in north-west Moscow, 12km (7 miles) from the Kremlin, BBC reported.
He was evacuated to a hospital by helicopter and placed in intensive care after the explosion, but eventually succumbed to his injuries, according to usually reliable Telegram sources.
Others - including one of Armen Sargsyan's bodyguards - were also reportedly seriously injured, with some sources saying one other person had died.
MNA
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