Mykola Patrushev, the secretary of Russia’s Security Council and a close ally of President Vladimir Putin, said on Tuesday that Ukraine was “definitely” behind the terrorist attack that took place at the Crocus City Hall concert hall in Moscow on Friday night, Reuters reported.

Vladimir Putin and Mykola PatrusevPhoto: TASS / ddp USA / Profimedia

Patrushev, who some analysts see as the “obvious successor” to President Vladimir Putin, made the comment after a reporter asked him if “ISIS or Ukraine?” was behind the attack.

“Ukraine, of course,” replied Patrushev, according to a video published by the Russian news channel SHOT.

The news is updated.