In response to the Trump administration’s demands that Europe spend more on its own defense, and as part of a broader hardening of trade positions between the United States and Europe as a result of the Trump administration’s trade policies, Europe is moving forward with the European Defence Fund, which will block non-European firms (including U.S. firms) from billions of dollars in European defense spending. (Ironically, the Trump administration’s own “Buy American” initiative in procurement apparently has been stalled over the past year, and the Trump administration has pushed recently to expand foreign military sales by U.S. defense firms.) The European initiative, which goes beyond the protections of the 2009 European defense directive, may be a violation of the many reciprocal defense procurement agreements between the United States and its European allies. European officials have defended these bars against non-European contractors as “reciprocity” for U.S. security constraints on foreign ownership and control in the U.S. defense industrial base, but the protectionism of the European initiative appears to go well beyond normal security concerns — inspired, perhaps, by the Trump administration’s expansive use of “national security” as a rationale for protectionism.