Before the Russian invasion of Ukraine, the possibility of nuclear war felt like a problem of days past. Now, as great-power competition heats up, the potential for nuclear conflict seems higher than at any point in decades. How did the nuclear taboo fade, and what does nuclear proliferation mean for the United States?   Featured Guests: J. Andrés Gannon (Stanton Nuclear Security Fellow, CFR) Rupal N. Mehta (Associate Professor of Political Science, University of Nebraska-Lincoln)   For an episode transcript and show notes, visit us at https://www.cfr.org/podcasts/new-nuclear-age