Strengthening the Refugee Regime calls for enhancing responsibility sharing. Responsibility sharing was a central commitment in the New York Declaration for Refugees and Migrants. It also is a key commitment in the preamble to the landmark 1951 Refugee Convention. Countries of first refuge are promised that their providing refuge will be met by “international cooperation,” though without specifying its content. Yet, just as the 1951 Refugee Convention failed to define what international cooperation meant; so too the New York Declaration is – as was the Humanitarian Summit before it – long on principles; and short on specific commitments.