Is the World on the Cusp of Nuclear Proliferation?

There's no evidence to suggest that we are, but it's still very early in the process. The United States takes a different calculus when dealing with adversaries that are also nuclear armed. If you could design any field research trip to Eastern Europe to include Ukraine right now, what would it be? And listeners at home, I didn't prep them for this question, so they're just making it up right now.