According to the new U.S. National Security Strategy, one of America’s policy priorities for Europe should be “ending the perception, and preventing the reality, of NATO as a perpetually expanding alliance.” By opposing NATO membership for Ukraine, the Trump administration has already expressed its doubts about the wisdom of NATO’s enlargement policy. However, other allies continue to adhere to NATO’s agreed-upon stance that the door remains open and Ukraine is on an “irreversible path” to