Pakistan’s president on Saturday warned neighbouring Afghanistan’s Taliban government that it had “crossed a red line” by launching drone attacks on civilian areas in Pakistan and said the administration in Kabul had brought “grave consequences upon itself”. The statement by Asif Ali Zardari was the latest in what has become the deadliest fighting yet between the two neighbours. The cross-border clashes, which erupted late last month, have shown no signs of abating despite efforts by China and...