Some of those calling for even a “limited” no-fly zone admit that they are willing to see the United States and its Nato allies wage war against Russia in defense of Ukraine. For example, one prominent signatory of a letter advocating a no-fly zone has recently admitted that a no-fly zone “is an act of war ... You have to enforce a no-fly zone, which means you have to be willing to use force against those who break the no-fly zone.” Michael John Williams, Syracuse University