Russia Ukraine war, page-212369

"...can you expllain why it took the police an well over an hour to appear ..."
False narrative.

"...can you explain how there was no extra security when the US warned three days prior of a terrorist attack in Moscow ..."
Factually incorrect statement. US issued their warning around March 7th. The attack happened March 22nd. 15 days. Not three.
These terrorists where spotted at the Crocus City halld in video footage on multiple days after 7th of March. They were looking for an opportunity. It's impossible to completely secure the city the size of Moscow indefinitely.

"...Can you exc[lain how ISIS had the video if Ukraine did it ..."
Can you explain to me how the footage of Brenton Tarrant, that shot up a mosque in New Zealand a few years back, appeared all over the place? Could it be because of something they call "the internet"?