S ergey Lavrov , the Russian foreign minister, can rarely be described as looking happy. His brick wall of a face and somber voice, worn down by many years of smoking Marlboros, have earned him the nickname “Minister No.” But when the question of Greenland came up yesterday at his press conference in Moscow, Lavrov seemed to come alive, even permitting himself a smile and a chuckle as he talked about President Trump’s imperial designs on the Danish territory and the response from NATO allies. “