When asked if the assault represented an intelligence service failure, the Kremlin said that Russia's standoff with the West meant intelligence-sharing was not happening in the way it used to.
French officials were holding a meeting on Monday to look at specific measures to step up security, such as checking bags on entrance to concert halls or places of worship.
Vladimir Kara-Murza, who suffers from a neurological condition after surviving two attempts to poison him, was transferred to a new Siberian penal colony in January.
Three story building in Kyiv targeted by Russian missiles on Monday, with missile debris falling in three other districts within the city.
Russia on Monday cast doubt on assertions by the United States that the Islamic State militant group was responsible for a gun attack on a concert hall outside Moscow that killed 137 people.
A fire today at a power plant in Russia's Rostov closed two power units, briefly disrupting supply.
The Interfax news agency reported earlier on Sunday, citing local media, that the gunmen might belong to the Combat Brotherhood organization.
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