On 22nd January 2021, the Treaty on the Prohibition of Nuclear Weapons (TPNW) enters into force. The UN Secretary-General will convene a first meeting of states parties within one year. Also in 2021, states parties to the Treaty on the Non-proliferation of Nuclear Weapons (NPT) are scheduled to meet for the 10th Review Conference which was postponed from May 2020 because of the COVID-19 pandemic. Both meetings will tackle the crisis in nuclear disarmament and arms control – but from different angles. How can the international community ensure complementarity between the two treaties? How can states parties to the NPT and the TPNW jointly advance nuclear disarmament, to their mutual benefit? And how could such cooperation be constructively reflected in the outcome of the 10th NPT Review Conference? Lina-Marieke Hilgert, Angela Kane and Anastasia Malygina analyse these issues in the latest Deep Cuts Issue Brief - the paper is available online here.