This publication contains a background note for the thematic workshop on promoting circularity in rebuilding Ukrainian cities, organized on 25 November 2022. The first part covers key challenges faced by cities in Ukraine, as well as key national legal acts and regulations relevant to circularity, key organizations and data, and key national and local programmes in place before and during the war. The second part lists relevant tools and instruments of the United Nations and other international organizations, which can help Ukraine address the challenges that its cities are facing.