Since 2006, Fabien is an active member of the RNJ +.
In 2013 Fabien was appointed General Secretary of the RNJ + until 2017. In March 2017 Fabien was elected President and Legal Representative of the RNJ + .
Fabien participates a lot in advocacy meetings especially at the East African Community level. Today RNJ + is in national decision-making bodies like the Country Coordinating Mechanism (CCM) and National AIDS Councils (CNLS).