The increasing involvement of external Actors in internal conflicts within the MENA is enhancing social fragmentation while preventing political reconciliation. The conflicts in Libya, Iraqand Syria, but also in Yemen - where a civil war has resulted in a military intervention by the Saudi-led coalition of Arab states - stand as a testament to the deep crises gripping the Middle East state system. The root causes, impact and future trajectories of these conflicts are at the centre of a new series of IAI research papers, articles and studies.