RAWALPINDI, Pakistan - US Defense Secretary Chuck Hagel arrived in Pakistan on Monday for what is likely to be a day of tough talks with senior officials about security and the use of US drones - the first Pentagon chief to visit Islamabad in almost four years.The United States has long had a complicated relationship with Pakistan and ties have been further soured by a dispute over US drones targeting militants. Islamabad says such strikes kill too many civilians and violate its sovereignty.Protests by anti-drone activists prompted the United States to suspend ground shipments of NATO cargo leaving Afghanistan via Pakistan last week.
