What are the challenges faced by the probation services when dealing with radicalised persons and returning foreign terrorist fighters (FTFs) in probation? What are the needs of probation officers in terms of training vis-à-vis this specific group of offenders? Although experience of probation with FTFs is still very limited, it is possible to discuss developments by looking, for example, at how probation deals with other types of serious offenders, e.g. sexual offenders and domestic terrorists from previous conflicts. RAN’s Prison and Probation Working Group organised a joint meeting to discuss these challenges with the Confederation of European Probation (CEP). The event took place in Dublin (IE) at the premises of the Irish Probation Service. This ex post paper reflects the discussions that took place during the meeting, and especially during the smaller group discussions organised to foster interaction between participants.