Eric Brewer is deputy vice president at the Nuclear Threat Initiative and has served on the National Security Council and National Intelligence Council.
South Korea has long been on the list of potential over-the-horizon proliferation challenges, but growing debates in Seoul about its nuclear options are quickly moving it toward the front of the U.S. nonproliferation agenda.
Yoon’s comments have fueled a debate in Washington over how to handle a problem that policymakers cannot wish away.
Although Russia’s war has created nuclear risks, the risk that it will unleash a wave of nuclear proliferation is lower than many believe.
