A method and apparatus related to a first radio network node serving a first UE in a first mobile radio network for enabling a D2D communication with a second UE served by a second radio network node in a second radio network. The first radio network node establishes a connection with the second radio network node. The first UE (230) requests to the first radio network node to enable a communication with the second user equipment (290). The first radio network sends a first message comprising information related to the first UE (230) to the second radio network node (280) for configuration of the second UE (290). The first radio network node receives a second message for configuration of the first UE (230) and sends to the first UE (230) a third message related to the second UE.