A public row between Seoul and the US-led United Nations Command (UNC) has revealed a fresh fault line over how the two interpret North Korea’s recent border fortification activities.South Korea views its arch-rival’s actions as a violation of the 1953 Korean war armistice agreement. The UNC does not.The dispute follows a separate disagreement over which authority should govern access to the demilitarised zone (DMZ), while analysts say differences also persist between Seoul and Washington over...