WASHINGTON (Reuters) - NATO must remain focused on fostering stability in Afghanistan despite the protests and violence that have gripped the country following the burning of copies of the Koran on a NATO military base, the alliance's head said on Tuesday. "Despite the tragedy of this incident and the challenges we face, we must not lose sight of our goal, a stable Afghanistan. That is in all of our interest; that must remain the focus of our shared effort," NATO Secretary-General Anders Fogh Rasmussen said during an alliance seminar in Washington. ...