At Crooked Timber Henry Farrell highlights a point of modern etiquette:
This apology by former NSA head Michael Hayden to Angela Merkel is pretty interesting as apologies go.
Although I’m not prepared to apologize for conducting intelligence against another nation, I am prepared to apologize for embarrassing a good friend. I am prepared to apologize for the fact we couldn’t keep whatever it was we may or may not have been doing secret and therefore put a good friend in a very difficult position. Shame on us. That’s our fault.