As part of its core mandate, UNHCR has a
supervisory role in ensuring compliance with treaty obligations, including through monitoring and reporting. In line with Article 35 of the 1951 Refugee Convention, state parties to the Convention have a duty to cooperate with UNHCR and to facilitate its supervisory responsibilities, including through the provision of relevant information.
The role of UNHCR is also reflected in the legal instruments conforming the Common European Asylum System (CEAS).