I mean https://en.m.wikipedia.org/wiki/Crocus_City_Hall_attack

I don't think this was between two different groups, it was just terrorism against civilians

Six people have been killed in what is reported as prevention of terrorism acts in Ingushetia: https://meduza.io/news/2024/03/03/v-ingushskom-karabulake-vveli-rezhim-kto-vlasti-soobschayut-ob-ubiystve-shesti-boevikov

Would deaths of pro-Navalny protesters in custody count? I think somewhere between 150-400 were arrested

I guess all the suspicious deaths don't count? "Internal conflict" is quite vague.

@marktwse i don't think this satisfies the condition in the description of "between two organized groups"