There are a number of calls for NATO to establish a no-fly zone over Ukraine, including from Ukrainian President Volodymyr Zelenskyy. NATO has rejected the idea because it comes with significant risks.
Joshua Pollack, a senior research associate at the Middlebury Institute of International Studies in Monterey and the editor of the Nonproliferation Review, says one of those risks is a nuclear conflict with Russia.
This article was originally published on WBUR.org.
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