Beatrice Fihn, executive director of the International Campaign to Abolish Nuclear Weapons, comes back to Press the Button to discuss the Treaty on the Prohibition of Nuclear Weapons, a UN resolution that was passed in 2017 and is now just five ratifications shy of the 50 needed to enter into force. Early Warning features our senior program officer/nuclear field coordinator John Carl Baker and Pranay Vaddi, a fellow in the Nuclear Policy Program at the Carnegie Endowment for International Peace, discussing prospects for US-Russia arms control and DPRK/ROK relations.