Fleeing Irpin, Ukraine, March 2022
Mikhail Palinchak / Reuters

Faced with a brutal Russian invasion of Ukraine, many Americans and Europeans are pushing for their governments to provide as much military support as possible to Kyiv. One idea that a number of prominent observers and commentators have seized on is the establishment of a no-fly zone—that is, using force (or the threat of force) to keep Russian aircraft out of some segment of the airspace above Ukraine, in order to prevent Russian air strikes on Ukrainian military forces and civilians in the area. Creating such a zone would involve a combination of day-to-day intelligence collection, observations from the

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