Bangladesh, Jan. 22 -- President Donald Trumps latest bout of erratic behavior — culminating in a public campaign to acquire Greenland while linking that policy to not receiving the Nobel Peace Prize — is alarming international observers and allies alike. Trump reportedly dispatched a message to Norways prime minister asserting that, because he had been “snubbed” by the Nobel committee, he no longer felt any “obligation to think purely of Peace,” thereby rationalizing intensified pressure on Denmark and European NATO members over Greenlands future.

This move included threats of tariffs against several European countries and revived speculation that US military options remain on the table — this s...