North Korea's state-run TV reports that leader Kim Jong Un has said his country's blasting of roads and railways connected to South Korea means not only their physical closure but also the removal of the "useless awareness about fellow countrymen and unreasonable idea of reunification."

Korean Central Television reported on Friday that Kim inspected an army corps headquarters the previous day and was briefed on the combat readiness of the corps' brigades.

He reportedly showed his readiness to resort to a hardline approach if his country's sovereignty is violated by the South.

North Korea is believed to have revised its Constitution last week at the Supreme People's Assembly to define South Korea as the "No.1 hostile country."

Diplomatic sources say Kim is emphasizing that South Korea is a hostile country in an attempt to ramp up solidarity among the people of his country.