In an address to the nation, Putin declared March 24 as a day of national mourning, condemning the "bloody, barbaric terrorist attack" and vowing to bring the perpetrators, organisers, and instigators to justice. He emphasised, "We will identify and punish everyone who stands behind the terrorists, who prepared this atrocity, this strike against Russia, against our people."

"They tried to hide and moved towards Ukraine, where, according to preliminary data, a window was prepared for them from the Ukrainian side to cross the state border," news agency Reuters quoted Putin.

The attack, which occurred on Friday night in a suburban Moscow concert hall, resulted in the deaths of at least 115 people, marking it as the deadliest assault in Russia in two decades. Putin's accusations against Ukraine further escalated tensions in the region.

However, Ukraine swiftly refuted Putin's claims, with a spokesman for Kyiv's military spy agency stating, "Ukraine was not involved in Friday's shooting attack near Moscow and suggestions of a Ukrainian link have nothing in common with reality," as reported by Reuters.

The attack, which occurred during a concert in a suburban Moscow venue, resulted in the deaths of at least 115 people, marking it as the deadliest assault in Russia in two decades. Numerous others were injured in the rampage.