T he coffee corner at Hotel Bayerischer Hof in Munich is so mobbed with diplomats and executives exchanging business cards and guzzling caffeine that it’s easy to miss even the most recognizable faces. And Jens-Frederik Nielsen is not one of those. Still, the baby-faced prime minister of Greenland was surrounded by throngs of people looking to shake his hand, pass him their card, or take a selfie with him at the annual Munich Security Conference, the first major get-together of European defense