Russian videos appearing to show Kremlin drone attack - what do we know?

Russia has accused Ukraine of trying to assassinate President Vladimir Putin by using drones to target his residence in the Kremlin in central Moscow.

Ukraine's President Zelensky has denied his country is behind the attack.
Footage appears to show an explosion at the Kremlin.

But can we verify the footage? And what do we know

about the attack so far?
Russian videos appearing to show Kremlin drone attack - what do we know?