Is it prohibited to turn right in this situation even when it does not impede movement of other road users?

According to the hierarchy of rules, signals given by a person directing traffic (e.g., a police officer) take precedence over traffic lights and road signs. The stance of the police officer shown in the picture – facing forwards with arms outstretched – means it is strictly forbidden to enter the area behind them. The driver must stop and cannot perform any manoeuvre, including turning right, regardless of whether it would obstruct other traffic.