As a note. Crocus City Hall shooting in Moscow. Claimed to be ISIS, Kremlin says 11 arrested, 4 directly involved in the attack, tried to fled to Ukraine.
https://www.aljazeera.com/news/2024/3/23/moscow-concert-hall-attack-what-do-we-know-so-far
In criticism of the Putin-regime we will probably see claims that the security forces of Russia are both incompetent to allow and mastermind to orchestrate the attack at the same time. So who knows.