Russian authorities accused Ukraine on Wednesday of attempting to attack the Kremlin with two drones overnight in an effort to assassinate President Vladimir Putin.
The Kremlin decried the alleged attack attempt as a "terrorist act" and said Russian military and security forces stopped the drones before they could strike.
In a statement carried by Russian state-run news agencies, it said no casualties took place.
Kremlin spokesman Dmitry Peskov told Russia's state news agency RIA Novosti that Putin wasn't in the Kremlin at the time and was working from the Novo-Ogaryovo residence.
The Kremlin added that Putin was safe and his schedule was unchanged.
There were no immediate comment from Ukrainian authorities. The Kremlin didn't present any evidence from the reported incident, and its statement included few details.
Tass quoted the statement as saying that the Kremlin considered the development to be a deliberate attempt on Putin's life ahead of the Victory Day that Russia celebrates on May 9.
Kremlin spokesman Peskov said a military parade would take place as scheduled that day.
Russia retains the right to respond "when and where it sees fit," the Tass report said, quoting the statement.