Nuclear weapons today remain a very real existential threat to the future of humanity. Recent developments such as Putin’s posturing regarding use in Ukraine, combined with the stalling of international efforts to reduce nuclear stockpiles, force us to reconsider the ethics of nuclear weapons at this critical moment for global security. On August 9 —78 years to the day after the U.S. dropped an atomic bomb on Nagasaki—Carnegie Council convened a virtual panel to reflect on and explore emerging ethical questions surrounding nuclear weapons, including the maintenance, potential use, and position as an instrument of deterrence and political power. The event builds upon a symposium collection on nuclear ethics published in the most recent issue of Ethics & International Affairs, the quarterly journal of Carnegie Council. For more, please go to carnegiecouncil.org.