CAMBRIDGE We live in a world where geopolitical stability relies largely on deterrence. But how can we prove that deterrence works?Consider the ongoing war in Europe. Beginning in December 2021, US President Joe Biden warned Russian President Vladimir Putin that Russia would face severe new sanctions if he invaded Ukraine, to no avail. Then, when the United States and its
CAMBRIDGE We live in a world where geopolitical stability relies largely on deterrence. But how can we prove that deterrence works?Consider the ongoing war in Europe. Beginning in December 2021, US President Joe Biden warned Russian President Vladimir Putin that Russia would face severe new sanctions if he invaded Ukraine, to no avail. Then, when the United States and its