As President Trump kicks off a bruising NATO summit, trans-Atlantic relations are said to be in the grip of an unprecedented crisis. On multiple fronts—defense spending, Iran sanctions, trade, and immigration—the United States appears to be on a collision course with its European allies. Running through these disputes is a deeper sense of division inside the West, as Trump questions the cost and wisdom of American troop deployments in places like Germany, criticizes the European Union as a threat to American interests, and seems more enthusiastic about reconciling with an authoritarian Russia than standing in solidarity with democracies like Germany and France.

For their part, multiple European leaders have made clear the unease they feel toward their American counterpart. “With friends like that, who needs enemies,” tweeted European Council President Donald Tusk earlier this spring, subsequently warning of the EU’s need to prepare for “worst case scenarios” in Western unity. German Chancellor Angela Merkel has declared that Europe can no longer rely exclusively on Washington for protection but instead “must take its destiny in its own hands.”

Read more here.