The Weakness of a Ukrainian Nuclear Deterrent: Counterfactuals and the Stability-Instability Paradox

(updated below)

Since the Russian incursion in Crimea at the end of February, a meme has been circulating among some national security commentators that Ukraine should have kept the nuclear arsenal it inherited following the collapse of the Soviet Union. The most forceful proponent that Kiev would have been better off maintaining a nuclear deterrent was and is University of Chicago political scientist John Mearsheimer. At the end of the Cold War, Mearsheimer argued in Foreign Affairs (pdf),

A nuclear Ukraine makes sense for two reasons. First, it is imperative to maintain peace between Russia and Ukraineā€¦ Ukraine cannot . . .
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