A psychologist might diagnose what Europe’s envoys in America are experiencing as psychosocial disorientation, a state of confusion about one’s very identity or future triggered by the administration’s emphatic break with the post-1945 order that Harry Truman first shaped and that’s been nurtured by every successive U.S. president — that is until Donald J. Trump.

There are several stages of transition if one wants to cope with disorientation, starting with accepting the loss of what’s familiar. Those suffering from upheaval should focus on what’s small and manageable to anchor themselves, like organizing, say, a Christmas party, and then shift from trying to resist change and slowly learn to adapt. Recovery in highly transformative times requires a readiness to embrace uncertainty.