What do Kabul attacks signal in the fight for Afghanistan's future?

(CNN) -- After a 20-hour battle, a Taliban assault on the U.S. Embassy and NATO command center in central Kabul was brought to a bloody end Wednesday with the deaths of half a dozen militants. - What do Kabul attacks signal in the fight for Afghanistan's future?
US Says Kabul Embassy Hit by Group Tied to Pakistan's Army - businessweek