What does a circular blue sign with a white arrow pointing right mean in Europe?

What does a circular blue sign with a white arrow pointing right mean in Europe? It means turn right as a mandatory instruction.

The blue circle signals that the pictured movement is required, while the white arrow identifies the direction. Drivers must follow the arrow rather than treating it as a suggestion or merely as information about the road layout. At an intersection, this normally means making the next permitted turn to the right.

This sign belongs to the mandatory-sign family associated with the 1968 Vienna Convention on Road Signs and Signals. Convention-style mandatory signs are generally circular, with white symbols on blue backgrounds. The convention also recognizes a less common Type B design: a white or yellow circle with a red border and dark symbol.

It is easy to confuse the sign with a one-way-street or directional sign. A one-way sign describes the direction of traffic on a road, whereas the blue circular sign imposes a maneuver at the point where it is posted. Local road rules can add exceptions, such as permitted access for emergency vehicles or bicycles.