The Russian president, 71, addressed the nation and promised his people he would "punish" those responsible for the massacre.
ISIS-K - a brutal splinter cell of the death cult - has claimed responsibility for the savage attack.
At least four gunmen stormed the Crocus City Hall venue on the outskirts of Moscow during a rock show by the band Picnic.
They fired a salvo of machine gun shots into crowds of people as they ran for their lives - killing men, women and children.
The building was left with a collapsed roof after the terrorists started an inferno which ripped through the structure, trapping many civilians inside.
Russia claims it has already arrested the four suspected shooters and at least seven others in connection with the attack.
Yet, the Kremlin seems to already churning out unfounded claims and seeking to shift the blame onto Ukraine.
In a televised address to the nation, a furious Putin attempted to suggest the gunmen tried to escape to Ukraine after the "barbaric terrorist attack".
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