North Korean leader Kim Jong-un called on top military officials to bolster front-line units and turn the southern border into an “impregnable fortress”, state media reported on Monday. Kim gave the instruction at a meeting on Sunday where a photo released by the Korean Central News Agency (KCNA) showed him presiding over commanding military officers wearing full-dress uniform. The North Korean leader told the military officials that a “great change” would be made in an effort to deter war and...