Are you talking about the 46th Separate Special Operations Brigade? They are part of the Russian Guards. They have been very active in Donbas region for a few years. I know that the 141st Regiment is Chechen.
The 46th is not part of the RGF.
Full description: 46th Separate Special Operations Brigade of the Interior Troops of the Ministry of Internal Affairs of Russia.
Part of the Rosgvardyia (Russian National Guard).
Answers directly to V. Putin.
OMON units (https://military-history.fandom.com/wiki/OMON) used for zachistka (cleansing) operations.