By Ben Aris in Berlin Is the Kursk incursion by the Armed Forces of Ukraine (AFU) a big strategic blunder? Following the spectacular and rapid capture of over 90 settlements and more than 1,000 square kilometres of territory since August 6, military experts worry about the deteriorating position of Ukraine’s defence of the frontline in Donbas. While the incursion has been a great PR success, reversing the narrative from the defeatist growingUkraine fatigue back to the heroic Ukrainian David and his slingshot taking the fight into the Russian Goliath’s homeland for the first time since the Nazi…