The pledge was announced amid continuing controversy over the alleged bottle-rape of a detainee in a police station in Tatarstan’s capital, Kazan, and the man's death a short time later.
Since the alleged incident, scores of people have come forward and alleged that they have also been victims of police brutality in Kazan.
In the case of the detainee who died earlier this month, five police officers have been charged with abusing their positions, forging arrest papers, and deliberately inflicting serious physical harm.
Several senior Kazan police officers have been fired.
Human rights activists have called for a thorough investigation.