It comes after the UN Security Council adopted a resolution expanding sanctions against North Korea.

North Korea “abrogates all agreements on non-aggression reached between the North and the South,” the state-run Committee for the Peaceful Reunification of Korea said in a statement.

“It notifies the South side that it will immediately cut off the North-South hotline,” said the statement, carried by the official KCNA news agency.

South Korean President Park Geun-hye warned North Korea of firm retaliation against any military strikes or other provocations